The following is from Wikipedia
It is certain that events in space will cause life on Earth to come to an end. The certain events, however, will happen at an extremely long timescale measured in billions of years. Projections indicate that the Andromeda Galaxy is on a collision course with the Milky Way. Impact is predicted in about 3 billion years, and so Andromeda will approach at an average speed of about 140 kilometres (87 miles) per second; the two galaxies will probably merge to form a giant elliptical. This merging will most likely eject the solar system in a more eccentric orbit and an unwanted position in the merged galaxy causing our planet to become uninhabitable (an actual collision is unnecessary). In 6 to 7 billion years, stellar evolution predicts our sun will evolve into a red giant [4] and will probably completely envelop the Earth. Because of a new process in the sun's core (fusion of helium besides a fusion of hydrogen) and radiation pressure, the sun's diameter will expand to nearly Venus orbit. Besides the red giant option, there are some astronomers who believe that the sun is currently increasing in luminosity (at a very slow rate), and they predict that in fewer than one billion years, the Earth will be too hot for life as we know it to survive, and have too much radiation as well.
On an even longer time scale, the universe will come to an end. The current age of the universe is estimated as being 13.7 billion years. There are several competing theories as to the nature of our universe and how it will end, but in all cases, there will be no life possible. These scenarios take place on a considerably longer timescale than the expanding of the sun.
[edit]
Meteorite impact
In the history of the Earth, it is widely accepted that several large meteorites have hit Earth. The Cretaceous-Tertiary asteroid, for example, is theorized to have caused the extinction of the dinosaurs. If such an object struck the Earth it could have a serious impact on civilization. It's even possible that humanity would be completely destroyed: for this, the asteroid would need to be at least 1 km (0.6 miles) in diameter, but probably between 3–10 km (2–6 miles) [5]. Asteroids with a 1 km diameter impact the Earth every 0.5 million years [6] on average. Larger asteroids are more rare. The last large (>10 km) impact happened 65 million years ago. So-called Near-Earth asteroids are regularly being observed.
Some scientists believe there are patterns in the amount of meteorites hitting the earth. An interesting explanation of such a pattern is given by the hypothetical Nemesis star. This hypothesis states that a star named Nemesis regularly passes through a denser part of the Oort cloud, causing meteorite rains to collide onto Earth. However, the very existence of this pattern is not widely accepted, and the existence of the Nemesis star is highly controversial.
A star passage that will cause an increase of meteorites is the arrival of a star called Gliese 710. This star is probably moving on a collision course with the Solar System and will likely be at a distance 1.1 light years from the Sun in 1.4 million years. Some models predict that this will send large amounts of comets from the Oort cloud to the Earth[7]. Other models, such as the one by García-Sánchez, predict an increase of only 5%.
[edit]
Less likely cosmic threats
A number of other scenarios have been suggested. A Black Hole could enter the solar system [8]. If this happened, the result would be catastrophic. Another threat might come from Gamma ray bursts; some scientists believe this may have caused mass extinction 450 million years ago [9]. Both are very unlikely [10]. Still others see Extraterrestrial life as a possible threat to mankind [11]; although alien life has never been found, scientists such as Carl Sagan have postulated that the existence of extraterrestrial life is very likely. Even NASA sterilizes items returning from space to kill any potential "alien" bugs that might threaten humanity. Scientists consider such a scenario technically possible, but unlikely[
2006-07-22 13:20:42
·
answer #1
·
answered by rainphys 2
·
0⤊
0⤋
Maybe, maybe not, but there will be an end or almost end of human life if we don't start taking car of the environment. I was born in the 80's and remember so well how people were saying "save the Earth" "greenhouse gasses" "hole in the ozone". Now, it's getting more serious and if nothing happens soon by countries like the U.S. and China who burn the most fossil fuels, then we will have an ice age! People need to quit denying the fact that this WILL happen and we need to reverse the carbon dioxide emissions now!!!
2006-07-22 14:33:06
·
answer #2
·
answered by Anonymous
·
0⤊
0⤋
this is a fashion of speech this is obviously derived from that theory. The Bible immediately says the Earth has ends. Deu 13:7 specifically, of the gods of the folk that are around approximately you, nigh unto thee, or a techniques off from thee, from the single end of the earth even unto the different end of the earth;
2016-10-08 05:17:43
·
answer #3
·
answered by ? 4
·
0⤊
0⤋
scientists recently determined the universe is contracting rather than expanding. this could mean it's already on the decline as it recedes from the big bang but vrery unlikely it will happen in our lifetime. some scientists also think the universe retracts as well as expands so don't freak ok??-:) peace! check out astronmy sites and really enjoy the universe instead of freaking over the end. there are some AMAZINGLY beutiful scenes that out sattelites are capturing!
Vin
2006-07-22 13:10:39
·
answer #4
·
answered by Anonymous
·
0⤊
0⤋
What exaclty is your question? You post a link to a science site telling of the earth's end and you want the opinion of a bunch of uneducated peons? Whatever.
OF COURSE THERE WILL BE AN END!! Oi
2006-07-22 12:59:32
·
answer #5
·
answered by Anonymous
·
0⤊
0⤋
in approximately 15 billion years when the Sun turns into a Red Giant the earth will be vaporized..
2006-07-22 16:13:06
·
answer #6
·
answered by Anonymous
·
0⤊
0⤋
well, messenger is down. Isn't that one of the seven signs?
2006-07-22 12:58:18
·
answer #7
·
answered by Rich M 3
·
0⤊
0⤋
Of course there will!! but not too soon!!
2006-07-22 12:58:54
·
answer #8
·
answered by spawn_of_cookie_monster 3
·
0⤊
0⤋
What earth.?.
2006-07-22 13:00:54
·
answer #9
·
answered by doorseeker 1
·
0⤊
0⤋
Yes. 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001.5% X (multiply) 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000% sure, and may be more
2006-07-22 13:01:08
·
answer #10
·
answered by Palestini Detective 4
·
0⤊
0⤋