MetaFilter posts tagged with astronomy and asteroid

Pons-Brooks

jeffburdges — Mon, 17 Oct 2011 11:53:01 -0800

A reanalysis of historical astronomical observations suggests that Earth narrowly avoided an extinction event just over a hundred years ago in 1883. On August 12th and 13th 1883, the astronomer José Bonilla at the observatory in Zacatecas Mexico observed 450 objects passing across the face of the Sun, which he described as surrounded by mist, suggesting fragments of a comet. As no other observatories witnessed the fragments at that time, Hector Manterola at the National Autonomous University of Mexico has argued using parallax that the comet must have passed within 8000 km of the Earth. "If they had collided with Earth we would have had 3275 Tunguska events in two days, probably an extinction event."

Awwwwww!

Sys Rq — Fri, 29 Jul 2011 07:11:45 -0800

Jupiter has lots. Mars has some, too, as does Neptune. Turns out Earth's got a trojan asteroid of its own. Meet 2010 TK7, the blue planet's new baby brother.

Monolith delivery?

JaredSeth — Mon, 06 Oct 2008 19:13:12 -0800

Discovered just last night by the Catalina Sky Survey at Mount Lemmon Observatory, asteroid 2008 TC will enter the upper atmosphere (and should explode spectacularly) over Northern Sudan in around 30 minutes.

“A most dread portent took place, the sun gave forth its light without brightness.”

stbalbach — Fri, 30 May 2008 19:33:17 -0800

The Atlantic has an interesting article about the high probability of "space rocks" hitting the earth, possibly as high as a 1 in 10 chance of a major catastrophe each century. Not a new theme, but the article has some new developments suggesting it is more common than once thought. Includes a 10 minute video.

Run away! Run away!

starkeffect — Mon, 28 Jan 2008 02:27:44 -0800

Will asteroid 2007 TU24 devastate our planet due to "magnetic reconnection"? Bad Astronomy's Phil Plait doesn't think so.

Armageddon's Deep Impact

blahblahblah — Wed, 25 Oct 2006 22:47:01 -0800

An interactive map of the 174 major meteor impact craters. The largest crater we know of is the Vredefort Dome in South Africa, caused by a meteor some 10 km in diameter. Almost as large in the Sudbury Structure, located in Ontario, which contains some of the world's richest nickel and copper reserves, and has been only confirmed recently to be a crater. Third largest is the now-famous Chicxulub crater in the Yucatan, which probably killed the dinosaurs. Then take a look at an animation of asteroids near Earth [animated gif] and the list of minor planets that could hit us. Want to find out what happens when an meteor impacts in your area? Use the handy Earth Impacts Effects Program!

There can be no escape. . .

absalom — Sat, 08 Jan 2005 17:10:10 -0800

NASA's Chandra X-Ray Observatory recently detected [reg required] the largest explosion ever detected in the universe: an eruption releasing the energy of hundreds of millions of gamma ray bursts. Just to put it in perspective, a single GRB releases enough radiation to wipe out just about everything human beings would require for survival in a 1000 light year radius. (The Milky Way spans ~100,000 light years, while the United Federation of Planets spans about 8,000). Arthur C. Clarke has gone so far as suggesting that GRBs might be one of the reasons for Extra-Terrestrial silence: Gamma Ray Bursts are so large and inescapable, a single one would wipe out even an enormous galactic empire. Makes killer asteroids seem downright quaint.

Oooh my 'roids.

Frasermoo — Tue, 02 Sep 2003 01:14:53 -0800

Near Earth Objects A newly discovered 1.2 km wide asteroid has been given a Torino hazard rating of 1. Astronomers will continue to observe the space rock carefully to determine its orbit more accurately. [link via BBC Radio 5]<

An asteroid the size of a football field

anser — Thu, 20 Jun 2002 09:45:59 -0800

An asteroid the size of a football field just missed the Earth last Friday. Coming in fast out of the sun, where we ain't watching, it missed us by an astro-paltry 75,000 miles (a third the distance to the Moon). If it had hit, the impact would have been about 10 megatons -- not a planet-killer, but enough to spoil your picnic.

In related news, Attorney General Ashcroft arrested a box of moon rocks and the entire staff of the Jet Propulsion Laboratory in Pasadena, CA for questioning. The director of the Office of Orbital Security was at a pro-am golf tournament in Fond du Lac, WI and unavailable for a statement.

BentPenguin — Tue, 19 Mar 2002 09:13:33 -0800

Clueless! But wouldn't this have made a big dent in the middle east peace process?

NEAR shoemaker lands and survives.

warhol — Mon, 12 Feb 2001 12:35:05 -0800

NEAR shoemaker lands and survives. The NEAR Shoemaker spacecraft touched down on a barren space rock called Eros on Monday, in history’s first attempt to land an object on an asteroid. Scientists said the probe still appeared to be sending signals back to Earth after making contact, hinting that the car-sized probe survived the descent. The speed at impact was between 1.5-1.8 m/s. This marks the first time that a US spacecraft was the first to land on another body of the solar system. And, if the server is back up, it's worth checking out the project's website.

Lucifer's Hammer... misses.

baylink — Mon, 25 Dec 2000 18:50:30 -0800

Lucifer's Hammer... misses. Well, ok, maybe it was only his tack-hammer, but the people in London would have hated it... [scroll down to second story]