Showing posts with label Astronomy. Show all posts
Showing posts with label Astronomy. Show all posts

October 16, 2011

The Grand Canyon


Arguably one of America's most magnificent national parks is the Grand Canyon in northern Arizona. The Advanced Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft captured this 3-D view on July 14, 2011, created by draping the ASTER image over a Digital Elevation Model produced from ASTER stereo data. In this perspective view looking to the northeast, the buildings and roads in the center foreground are Grand Canyon Village. The Bright Angel Trail can be seen descending 3,000 feet (914 meters) to Indian Garden, before continuing to the Colorado River far below. Completing the 25-mile (40-kilometer) rim-to-rim hike takes the hiker to the North Rim and the North Rim Lodge. The ASTER image is located near 36 degrees north latitude, 112.1 degrees west longitude.


The Advanced Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft provided this spacebird's-eye view of the eastern part of Grand Canyon National Park in northern Arizona in this image, acquired July 14, 2011. In this perspective view looking to the west, the tourist facilities of Grand Canyon Village are visible in the upper left. The higher-elevation North Rim is seen on the right. The canyon is up to 9 miles (14.5 kilometers) wide and 5,600 feet (1,707 meters) deep, attesting to the power of moving water to carve Earth's surface. This 3-D view was created by draping the ASTER image over a Digital Elevation Model produced from ASTER stereo data .The ASTER image is located near 36 degrees north latitude, 112.1 degrees west longitude.

Photo credit (above): NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team; photo credit (below): NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team

March 6, 2011

Epic Voyage Through the Universe

This is a rather impressive video featuring different celestial objects within the universe. Can you name them all?

January 24, 2010

Tycho Crater by LRO


Tycho Crater is an one of the most prominent craters on the moon. It appears as a bright spot in the southern highlands with rays of bright material that stretch across much of the nearside. Its prominence is not due to its size: at 85 km in diameter, it's just one among thousands of this size or larger. What really makes Tycho stand out is its relative youth. It formed recently enough that its beautiful rays, material ejected during the impact event, are still visible as bright streaks. All craters start out looking like this after they form, but their rays gradually fade away as they sit on the surface, exposed to the space environment which over time darkens them until they fade into the background.

How old is Tycho? Because the impact event scattered material to such great distances, it's thought that some of the samples at the Apollo 17 landing site originated at the Tycho impact site. These samples are impact melt glass, and radiometric age dating tells us that they formed 108 million years ago. So if these samples are truly from Tycho, the crater formed 108 million years ago as well. This may still seem old, but compared to the 3.9 billion-year age for many large lunar craters, Tycho is the new kid on the block. Directly sampling material from within the crater would help us learn more about not just when Tycho formed, but the ages of terrains on other planets throughout the solar system.

...

Tycho is also of great scientific interest because it is so well preserved, it is a great place to study the mechanics of how an impact crater forms. ... The peak is thought to be material that has rebounded back up after being compressed in the impact, and though it's a peak now, it originated at greater depth than any other portion of the crater. The floor of the crater is covered in impact melt, rocks that were heated to such high temperatures during the impact event that they turned to liquid, and flowed across the floor. In [this] image, impact melt flowed downhill and pooled, where it cooled.

Photo Credit: NASA/Goddard/Arizona State University

January 20, 2010

The Known Universe

A video reminiscent of the famous Powers of Ten, but more up to date with respect to the nature and structure of the universe. Enjoy!

January 16, 2010

Milky Way Transit Authority

Samuel Arbesman, a postdoctoral sociologist at Harvard University, has created a semi-whimsical Milky Way Transit Authority map that's rather interesting. Inspired by Carl Sagan's novel, Contact, Arbesman has treated the various arms and spurs of the Milky Way in the manner of a subway map, complete with various stops and transfer stations. As Arbesman wrote:

This map is an attempt to approach our galaxy with a bit more familiarity than usual and get people thinking about long-term possibilities in outer space. Hopefully it can provide as a useful shorthand for our place in the Milky Way, the 'important' sights, and make inconceivable distances a bit less daunting. And while convenient interstellar travel is nothing more than a murky dream, and might always be that way, there is power in creating tools for beginning to wrap our minds around the interconnections of our galactic neighborhood.

I have attempted to actually make this map as accurate as possible, where each line corresponds to an arm of our galaxy, and the stations are actual places in their proper locations.

A larger PDF version of the map can be found here.

December 31, 2009

QuranClub Posts

The month is almost up and I see that I've written a grand total of two posts; pathetic, ain't it? I'd like to say I've been fairly busy this month and that's somewhat true, but the fact of the matter is that I've written four posts in December for the group blog QuranClub. So, in case you'd like some upbeat writing about Islam, I'd recommend the following posts. I wrote the first two posts in November, while the remainder were done in December:

  • Muslim Astronomy: 'Abd ar-Rahman as-Sufi and the "Small Cloud"
  • The Fledgling
  • Lost?
  • SRO @ MDG
  • Help for the Dying
  • The Pale Blue Dot
  • October 28, 2009

    JKCS041: Galaxy Cluster Smashes Distance Record

    Visible Light (Very Large Telescope (VLT)):


    XRays (Chandra):


    Composite:


    Photo Credits:
    X-ray: NASA/CXC/INAF/S.Andreon et al; Optical: DSS; ESO/VLT

    This image contains X-rays from NASA's Chandra X-ray Observatory, optical data from the Very Large Telescope (VLT) and optical and infrared data from the Digitized Sky Survey. This record-breaking object, known as JKCS041, is observed as it was when the Universe was just one quarter of its current age. X-rays from Chandra are displayed here as the diffuse blue region, while the individual galaxies in the cluster are seen in white in the VLT's optical data, embedded in the X-ray emission.

    JKCS041 was originally detected in 2006 with infrared observations from the United Kingdom Infrared Telescope (UKIRT). The distance to the cluster was then determined from optical and infrared observations from UKIRT, the Canada-France-Hawaii telescope in Hawaii and NASA's Spitzer Space Telescope. However, scientists were not sure if it was a true galaxy cluster, rather than one that has been caught in the act of forming. The shape and extent of the X-ray emission in the Chandra data, however, provided the definitive evidence that showed that JKCS041 was, indeed, a galaxy cluster. The Chandra data also allowed scientists to rule out other possible explanations for the data, including a group of galaxies, or a filament of galaxies seen along the line of sight.

    Galaxy clusters are the largest gravitationally-bound objects in the Universe. Scientists have calculated when they should start assembling in the early Universe, and JKCS041, at a distance of some 10.2 billion light years, is on the early edge of that epoch. Follow-on observations of JKCS041 will provide scientists with an opportunity to find important information about how the Universe evolved at this crucial stage.

    October 4, 2009

    Colorpulse: "A Glorious Dawn" (Cosmos Remixed)

    I forget off-hand how I stumbled across this video tonight, but it's one guy's "remix," if you will, of Carl Sagan's TV series, Cosmos: A Personal Voyage. Intermixed are snips of videos and "lyrics" "sung" by Stephen Hawking, taken from his Universe documentary. If you're interested in downloading the soundtrack from the video, click here.

    August 27, 2009

    My Tafsir on Surah Fussilat (41):9-12

    "The Bible was written to show us how to go to heaven, not how the heavens go." - Cardinal Cesar Baronio (1598), as cited by Galileo Galilei

    A couple days ago, I received a comment from a certain someone who asked about verses 41:10-12 in the Qur'an. This person is apparently under the impression that the Qur'an is suggesting that the Earth was created first in all the universe before anything else (including the stars). I told him that the verses were analogical, but I wanted to expand on the point further. Below are the relevant verses (41:9-12):

    Say: Is it that ye deny Him Who created the earth in two Days? And do ye join equals with Him? He is the Lord of (all) the Worlds.

    He set on the (earth), mountains standing firm, high above it, and bestowed blessings on the earth, and measure therein all things to give them nourishment in due proportion, in four Days, in accordance with (the needs of) those who seek (Sustenance).

    Moreover He comprehended in His design the sky, and it had been (as) smoke: He said to it and to the earth: "Come ye together, willingly or unwillingly." They said: "We do come (together), in willing obedience."

    So He completed them as seven firmaments in two Days, and He assigned to each heaven its duty and command. And We adorned the lower heaven with lights, and (provided it) with guard. Such is the Decree of (Him) the Exalted in Might, Full of Knowledge.

    First, I'm amused that verse 41:9 was skipped in the certain someone's original comment, if only because we both that he's become a self-proclaimed apostate. So, unless he's changed his mind and come back to a state of Islam (insha'allah), I'd say that his answer to the first question is "no." (Astaghfirullah!) Regardless...

    The thing about the remaining verses, 41:10-12, is that they follow a specific sequence. This sequence was done with the original recipients of the Qur'an in mind, that being the early Muslim community and the Jahiliyyah-era Arabs (this surah, Fussilat, being revealed in the later Makkan period). As any good writer knows, you write to the level of your audience. Verse 41:9, for example, talks about the creation of the Earth, but Allah (swt) uses concepts that the audience at the time of the revelation would have understood; i.e., it took two of His days to complete. He, Allah (swt), didn't talk about things like the nebular hypothesis of solar system formation or protoplanetary disks. That sort of thing would have been far above the heads of the original recipients of the Qur'an.

    So He followed a specific sequence that could be understood. Verse 41:10 first discusses the earth, the mountains, and the necessary chemicals - including water - that were needed to support life (once again, written in a way that could be understood by the original recipients). This verse came first, IMO, because everyone knows what the Earth is and would have asked a question like "How was the Earth made?" at some point in their life. The following verse, then, would be the next logical question: "How was the sky made?" And, finally, verse 41:12, completes the sequence by discussing the heavens and the stars. These verses were written in an order that is completely natural from the perspective of a human: we look down at the ground and then progressively higher, into the sky and then up to the heavens.

    The mistake is to assume that these verses show the actual sequence of creation. Like the quotation at the top of this post, the Qur'an was written to show us how to go to heaven, not how the heavens go. These four verses were revealed not to provide a scientific proof, but to discuss how the Earth, sky and heavens were created in a manner that a people with a lack of scientific knowledge could understand.

    Wa allahu alim. (And God knows best.)

    August 22, 2009

    The Big Bang

    A short, interesting video about the Big Bang. Be sure to take notes, you'll be quizzed after watching this. ;)

    July 21, 2009

    Backyard Astronomer Discovers Black Spot on Jupiter

    A very cool story out of Australia: an amateur astronomer found a very recent impact scar on Jupiter, near its south pole (the dark spot on the picture to the left). The impact most likely happened sometime in the middle of the night, around midnight, Monday morning; the astronomer, Anthony Wesley, first saw the scar around 1 am, when the planet had rotated the scar into view. The cause of the impact is not known just yet, but was most likely a comet. NASA has confirmed the impact, but is still investigating. Interestingly enough, the impact happened fifteen years after the famous Comet Shoemaker-Levy 9 impacts back in late July 1994.

    For the whole story, see Backyard astronomer discovers black spot on Jupiter - Times Online.

    June 29, 2009

    Kaguya's Last Orbit of the Moon

    All good things must come to an end. Occasionally, I've blogged about the Japanese spacecraft Selene, aka Kaguya, this being my fifth post to date. However, as planned, Kaguya crashed into the Moon very recently, on June 11th. The below video is a very clear movie from Kaguya's last orbit of the Moon. Although it's difficult to gauge the distance between the Moon and Kaguya, obviously Kaguya very narrowly misses plowing into some hilly terrain on its way down.

    The last photographs taken by Kaguya can be found here

    June 18, 2009

    Miscellaneous Links (18 June 2009)

    Astronomy & Science:
    SNR 0104: An Unusual Suspect (A supernova remnant (a star that blew up) with an unusual shape.)

    Stars at the Galactic Center (The center of the Milky Way galaxy, as seen in infrared (heat) light.)

    Streaming Dark Nebulas near B44

    M13: A Great Globular Cluster of Stars (One of the better pictures I've seen of M13.)

    NGC 6240: Merging Galaxies

    Discovery Magazine: Holes of Silence (Sonic black holes. Cool!)

    Science @ NASA: Mystery of the Missing Sunspots, Solved?

    Climate change is already having an impact in the Midwest and across the US (The good news: a longer growing season (by one week) for crops. The bad news: temperature and humidity increases, more winter and spring rain, less rain in the summer (i.e., more droughts), more flooding, lower water levels in the Great Lakes, reduced air quality, more insect-borne diseases, pollen and fungi. But don't worry: global warming is just a hoax, doncha know?)


    Comics:
    Dilbert ("Too crazy too fast.")

    One Big Happy ("Big deal! I know how to say, 'What's the matter with you? You're getting on my nerves," in Italian.")

    One Big Happy (Grandma vs. Grandpa.)

    One Big Happy (That's right, kids! All us daddies eat breakfast in our underwear. Don't puke while you watch! ;) )

    Working Daze (I had a supervisor like this, a guy who kept calling me "Jim." (Not my name.) I could never get him to remember my real name, but when he asked for "Jim" I knew he was asking for me. :P )

    Working Daze (Survivor's remorse.)


    Science Fiction:
    io9: The Composers That Make Space Adventures Epic (Can't disagree with a single one.)

    ListVerse: Top 10 Survival Tips For People In Horror Flicks (#11: Teenagers should never have sex! ;) )

    SciFi Scanner: Mary Robinette Kowal - Fantasy's Male Warriors Kick Butt (While Baring Butt)

    SF Signal: It's Time For Indy To Hang Up His Hat, For Good

    SF Signal: Do Literary Awards Affect Your Reading Choices?

    The Architects' Journal: The architecture of Star Wars (pt I) (See also part II.)


    The Truly Miscellaneous:
    APOD: Pyrenees Paraselene (Every now and then, APOD publishes photos that have little to do with Astronomy. This beautiful picture looks down at the Pyrenees mountains, which separate Spain from France, from a local observatory.)

    BWG: Asinine Assertion

    Google Fusion Tables

    IZ Reloaded: Laptop Uses AA Batteries

    Kottke.org: 50 Films You Can Wait to See After You're Dead (I've seen three, "Son of the Mask" and "Catwoman," only because they were on TV, and "Rocky V," which was surprisingly good and shouldn't be on this list.)

    The Mad Logophile: Foreign Words & Phrases (This diary over at Daily Kos examines the meanings of several hundred foreign words and phrases, including twenty-three from the Middle East, in Arabic, Persian and Turkish.)

    WTF Is It Now?!?: Brett Favre, missing the spotlight, to torture country again

    Yet Another Web Site: Are audiophiles really this stupid?

    Yet Another Web Site: A really stupid article

    June 12, 2009

    Miscellaneous Links (11 June 2009)

    Astronomy and Science:
    Spirit Encounters Soft Ground on Mars

    Spokes Reappear on Saturn's Rings

    One Armed Spiral Galaxy NGC 4725 (Of all the recent APOD pictures I liked this one the best.)

    A Dusty Iris Nebula

    High population density triggers cultural explosions

    We Knew Black Holes Were Massive. Now Double That.


    Comics:
    Dilbert ("Is there some sort of rule against collecting money for your own birthday?" Why didn't I think of that? ;) )

    Luann (Typical American fair food: "Chocolate-dipped deep-fried donuts on a stick!")

    One Big Happy


    Others:
    IZ Reloaded: The 40 Second Electric Toothbrush (And Ladies, Father's Day is right around the corner! ;) )

    Photoshop Disasters: Hugo Boss: All This And No Brains Too (Low-brow modeling. ;) )

    Kennedy International: Mobiusbiking! (Who's first?)

    Strange Maps: 391 – Ireland As 100 People

    Strange Maps: 389 – America’s Mean Streak

    Strange Maps: 388 – US States As Countries of Equal Population (Singapore = Colorado!)


    Science Fiction:
    MIND MELD: New SF/F Recommendations for the Golden Age Reader (The post is a little long, and science fiction lends itself to subjective differences in tastes; however, the mind map at the bottom of the post, giving suggestions to different themes within SF/F was rather interesting - and with some good choices.)

    Science Fiction And Interest In Space Exploration ("Does the predominance of Harry Potter over science fiction bode well or ill for the future of public spaceflight support? What science fiction and non-fiction books would you give to a child or teenager to inspire them about space exploration?")

    1,001 Science Fiction Story Ideas

    Ten of the Most Classic Science Fiction Movie Scenes

    Star Trek ("How plausible does SF have to be? Not in terms of "ideas," but in terms of human behavior.")

    Mary Robinette Kowal - The Worst-Dressed Women Warriors in Fantasy

    The 25 Women Who Shook Sci-Fi (Characters, not writers - unfortunately.)

    May 29, 2009

    Links for 28 May 2009

    A little late but I have my reasons... :)

    Politics:
    Rachel Maddow Show: Cutting Through the Spin on Sonia Sotomayor

    Fox talker Peters has a Gitmo solution: Just kill them all ("You have to wonder just what level of moral and ethical depravity you have to reach to be a Fox News talker these days. ... Col. Ralph Peters -- who doesn't exactly have a track record for probity to begin with -- went on Neil Cavuto and offered a solution to dealing with terrorists at Guantanamo Bay -- just kill them all.")

    Krikorian: People should stop pronouncing Sotomayor’s name correctly. (It's amazing the amount of stupidity permeating the Republican party.)

    Sotomayor and MLB (Interesting. "It was Sotomayor's ruling that forced Major League Baseball players and owners to resume the national pastime in 1995 after a 234-day player strike wiped out the final six weeks of the regular season and the entire postseason in 1994.")

    ‘Censored’ Abu Ghraib photographs show rape of detainees. (Both of male and female prisoners.)

    Countdown: Worst Persons May 27, 2009


    Miscellaneous:
    The Phantom Torso Returns (The European Space Agency (ESA) sent a mannequin into space to determine radiation levels astronauts face. The conclusion: short trips (six months) to the moon are fine; trips to Mars may make the astronauts toast.)

    Volcanic Terrain on Mercury

    May 27, 2009

    Links for 27 May 2009

    Politics:
    Countdown: Worst Persons May 26, 2009 (Laura Ingraham, David Zurawik and Pete Hegseth)

    Keith Olbermann Talks to Erich "Mancow" Muller About His Waterboarding Experience (At least here's a guy who puts his money where his mouth as - as opposed to the coward Sean Hannity. "I was willing to prove and ready to prove that this was a joke and I was wrong. It was horrific. It was instantaneous and look I felt the effects for two days. I had chest pains. I told my wife, look I have two little kids-- we prayed. I said dear God help me. I had chest pains I was so stressed out by this.")

    Going off the rails on a crazy train (TBogg on the right's reaction to the Sotomayor nomination. "My sense is that, if they really want to go after and beat up on this Sotomayer, who presented herself very well this morning, they will pay for it at the polls for years to come. Not with Hispanics, who were lost to the party dating back to the Pete Wilson days (not that the peck-sniffier elements of the right can help themselves), or with women, but with people for whom "empathy" and compassion aren't qualities to be sneered at.")

    Tancredo: Sotomayor ‘Appears To Be A Racist’ (A classic case of “Pot - Kettle - Black.”)


    Economics:
    US and European Employment Rates

    Consumer Confidence Up (I agree, at least partly, with Bonddad that consumer confidence has increased due to the change in Washington politics. But I also think economic conditions have been improving as well over the past few months and people are responding to that as well.)


    Business:
    Three beautiful ads for dental floss


    Islam/Muslim Blogs:
    Quran Read-A-Long: Al-`Imran 1-9 Discuss the Quran Itself

    Lā ilaha illa al-Lāh, Muhammadun rasūlu l-Lāh (The shahada inside a flowery circular badge. Beautiful.)


    Miscellaneous:
    PSM (A Gillette video (cartoon) about "when there's no underbrush, the tree looks taller." Their advice: use short, light strokes. "Tastefully" done according to one blog (debatable), but definitely R-rated material here.)

    Whirlpool Galaxy Deep Field (Very nice pic of Messier 51, the famous Whirlpool Galaxy, and its companion galaxy NGC 5195. It's actually the detail of the smaller galaxy that makes this photo of interest for someone like me.)

    Q&A: Hobbit Director Guillermo del Toro on the Future of Film (An interview with film director Guillermo del Toro over at Wired. del Toro, if you’re not familiar, directed Blade II, both Hellboy movies, and the fantastic Pan’s Labyrinth - a must see movie if you’re not familiar with it. His discussion on the future of movies is interesting.)

    May 26, 2009

    Links for 26 May 2009

    Politics:
    Mapping the Fallen (Someone has done a mash-up of all the American and coalition soldiers who have died in Iraq and Afghanistan and marked both their hometowns and the place in which they died on Google Earth.)

    Terror Plotter's Sick Brother: 'He Did It For Me' ("What's worse: A healthcare system where someone is so desperate, he'd blow up buildings to pay for his brother's treatment [the brother apparently has a bad liver], or an FBI that thinks nothing of setting people up so they can claim they caught some 'terrorists'?")

    Andrew Breitbart says Oprah is secretly running the Obama White House (This guy is a real loon!)

    The North Korean Nuclear Test

    Israel's Plans For Launching A War On Iran

    Obama Announces SCOTUS Pick: Sonia Sotomayor. Now Let The Games Begin! (See also Judge Sotomayor, Right-Wing Interest Groups Driven By Financial Motives In Attacking Obama’s Court Pick, and Obama To Name Sonia Sotomayor As His Supreme Court Nominee.)


    Economics:
    As Unemployment Claims Run Out, Many Workers Are Opting for Early Retirement


    Business:
    Cut your ad budget at your own risk (The advice here is frequently taught in business school and is really a no-brainer, but you'd be surprised how often managers do just the opposite. The results of the study are interesting: "Almost half of Americans believe that lack of advertising by a retail store, bank or auto dealership during a recession means the business must be struggling.")


    Islam/Muslim Blogs:
    Upcoming Productions (Bin Gregory announces his future seventh, insha'allah, and writes a wonderful bit of snark about the "Muslim Plot to Take Over the World™.")

    Lesson of the Death of 1st Lt. Roslyn Schulte

    A school 'condemned to death' ("Why are the authorities refusing to fund France's oldest Muslim school, now facing bankruptcy?")


    Miscellaneous:
    Hubble Floats Free

    Oslo Grand Prix: Horserse (I missed this one a couple days ago, but it's too good not to link to. Ever see a six-legged horse before? ;) )

    May 25, 2009

    Links for 25 May 2009

    Sorry for the lack of link posts the last few days; it's been a busy weekend. Today's post is very short (due to Memorial Day back in the U.S.)

    Politics:
    Tom Ridge disses Limbaugh as 'too shrill,' says Cheney is out to lunch too (A glimmer of intelligence in the Republican party.)

    Colin Powell on the Trouble With The Republican Party Base ("You can only do two things with a base. You can sit on it and watch the world go by, or you can build on it. I believe we should build on it.")

    Empire Media ("One issue I have with the U.S. media is its complete inability to reflect on what the U.S. is actually doing when they report on foreign reactions. ... Today the Washington Post's Craig Whitlock is outraged that Spanish prosecutors and judges care about international crimes against humanity. He does not spend a second on thinking about how much of that may be really justified when one takes into account the openly admitted misdeeds of the U.S.")


    Miscellaneous:
    Carina Nebula Panorama from Hubble (APOD has featured this photograph before, but it's still an awesome pic.)

    Salt and Pepper Shakers that look like Batteries (Cool!)

    384 – Does My Metro Area Look Big in this Ring Road? (Ring roads of the world.)