Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.astronomy.com/magazine/2013/05/the-end-of-the-line-for-our-planet
Äàòà èçìåíåíèÿ: Unknown
Äàòà èíäåêñèðîâàíèÿ: Sun Apr 10 06:15:32 2016
Êîäèðîâêà: ISO8859-5

Ïîèñêîâûå ñëîâà: ï ï ï ï ï ï ï ï ï ï ï ï
The end of the line for our planet | Astronomy.com
Tonight's Sky
Sun
ò??
ò??
Sun
Moon
ò??
ò??
Moon
ò??
ò??
Mercury
ò??
ò??
Mercury
ò??
Venus
ò??
ò??
Venus
ò??
Mars
ò??
ò??
Mars
ò??
Jupiter
ò??
ò??
Jupiter
ò??
Saturn
ò??
ò??
Saturn
ò??

Tonight's Sky ò?? Change location

OR

Searching...

Tonight's Sky ò?? Select location

Tonight's Sky ò?? Enter coordinates

ÒÀ '
ÒÀ '

The end of the line for our planet

A marauding near-Earth asteroid could spell doom for civilization long before the Sun starts to bake us a billion or so years from now. As intellectual exercises, however, both fates are worth pondering.
RELATED TOPICS: NEAR EARTH OBJECTS
Earth fate
As Martin Rees explained in “Is this our final century?” the threat humanity faces from asteroids is one of the few that scientists can quantify. Astronomers have found 90 percent or more of the really big objects — those with diameters of at least 0.6 mile (1 kilometer) — that potentially could hit Earth, and have started cataloging the smaller bodies that could cause significant damage.

Astronomy magazine subscribers can read the full column for free. Just make sure you're registered with the website.

Already a subscriber? Register now!

Registration is FREE and takes only a few seconds to complete. If you are already registered on Astronomy.com, please log in below.
ADVERTISEMENT

FREE EMAIL NEWSLETTER

Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter.

ADVERTISEMENT
ADVERTISEMENT
asy_gravitational_eguide

Click here to receive a FREE e-Guide exclusively from Astronomy magazine.

Find us on Facebook