Free Republic
Browse · Search
General/Chat
Topics · Post Article

Skip to comments.

Astronomy Picture of the Day - Orbits of Potentially Hazardous Asteroids
NASA ^ | 30 Jun, 2023 | Illustration Credit: NASA, JPL-Caltech

Posted on 06/30/2023 2:14:07 PM PDT by MtnClimber

Explanation: Are asteroids dangerous? Some are, but the likelihood of a dangerous asteroid striking the Earth during any given year is low. Because some past mass extinction events have been linked to asteroid impacts, however, humanity has made it a priority to find and catalog those asteroids that may one day affect life on Earth. Pictured here are the orbits of the over 1,000 known Potentially Hazardous Asteroids (PHAs). These documented tumbling boulders of rock and ice are over 140 meters across and will pass within 7.5 million kilometers of Earth -- about 20 times the distance to the Moon. Although none of them will strike the Earth in the next 100 years -- not all PHAs have been discovered, and past 100 years, many orbits become hard to predict. Were an asteroid of this size to impact the Earth, it could raise dangerous tsunamis, for example. To investigate Earth-saving strategies, NASA successfully tested the Double Asteroid Redirection Test (DART) mission last year. Of course, rocks and ice bits of much smaller size strike the Earth every day, usually pose no danger, and sometimes create memorable fireball and meteor displays.


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: astronomy; catastrophism; nasa; science
Navigation: use the links below to view more comments.
first previous 1-2021-24 last
To: dragnet2

THAT hasn’t been buffed out yet?


21 posted on 06/30/2023 6:17:31 PM PDT by Paladin2 (Editing on an iPhone is problematic given fat fingers)
[ Post Reply | Private Reply | To 9 | View Replies]

To: MtnClimber

I use to have a spirograph that made lines like that.


22 posted on 07/01/2023 12:32:55 AM PDT by minnesota_bound (Need more money to buy everything now)
[ Post Reply | Private Reply | To 2 | View Replies]

To: 75thOVI; Abathar; agrace; aimhigh; Alice in Wonderland; AnalogReigns; AndrewC; aragorn; ...
Any rocky object a half mile or more in diameter slamming into the surface of the Earth would end our civilization.

Oh wait, the Deep State is already taking care off that.



23 posted on 07/01/2023 6:52:29 AM PDT by SunkenCiv (Putin should skip ahead to where he kills himself in the bunker.)
[ Post Reply | Private Reply | View Replies]

To: MtnClimber

You need a 3D projection for the full picture.


24 posted on 07/01/2023 2:27:50 PM PDT by JimRed (TERM LIMITS, NOW! Militia to the border! TRUTH is the new HATE SPEECH.)
[ Post Reply | Private Reply | To 2 | View Replies]


Navigation: use the links below to view more comments.
first previous 1-2021-24 last

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
General/Chat
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson