99942 Apophis

Small pieces of rock, with a big influence (just ask the dinosaurs).
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Christopher K.
Posts: 5482
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

99942 Apophis

Post by Christopher K. »

Astronomers discovered Apophis in 2004. The first calculations showed a 2.7% possibility of the object (which is about meters wide) striking the Earth in 2029. New information rules out that scenario, although there is still a tiny chance Apophis will hit Earth in 2036.

More information:
April 2013 Sky & Telescope, p. 10
http://www.nasa.gov/mission_pages/aster ... 0110.html#

KristaBleez
Posts: 7
Joined: January 3rd, 2013, 9:37 pm

Re: 99942 Apophis

Post by KristaBleez »

The article on inhabiting caves is a great read in that issue also.

Christopher K.
Posts: 5482
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: 99942 Apophis

Post by Christopher K. »

Astronomy's 60 Greatest Mysteries (a 2016 publication) had sixty mysteries divided into six sections. The first section was Earth, and the second Earth mystery was whether impacts explain all of Earth's mass extinctions. Infamously, the Chicxulub Impact about sixty-five million years ago killed out almost all Earth life.

David Kring of the Lunar and Planetary Institute stated that the jury was still out. The main reason: even though the best estimate suggests five horrible events of that destructive level occur every ~500 million years, and there have been five major extinctions in the past 540 million years, geological evidence to confirm all of this isn't readily available. There are over 100 sites showing the Cretaceous-Tertiary boundary, and a few sites each showing the Triassic-Jurassic transition and the Permian-Triassic transition, there are no sites for the oldest two extinctions.

About David Kring:
https://www.lpi.usra.edu/science/staff/kring/

Christopher K.
Posts: 5482
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: 99942 Apophis

Post by Christopher K. »

In December, a new display will premiere showcasing Apophis. The display will stand for 100 months, until the asteroid's close approach on Friday 13 April 2029; it's magnitude will be approximately 7.1.

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