| 查看: 631 | 回复: 5 | |||
[交流]
Everyday News-Earth's Little Buddy
|
Earth has a new sidekick. Astronomers have spotted a small asteroid traveling around our sun in the same general path as our planet. The 300-meter-wide rock, dubbed 2010 TK7, is Earth's first so-called "Trojan" asteroid, a class of bodies that gets its name from the asteroids that orbit the sun at the gravitationally stable points 60° ahead of and 60° behind Jupiter—which, according to astronomical convention, are individually named after prominent figures from the Trojan War (Brad Pitt excepted). Besides the thousands of Trojans that co-orbit the sun with Jupiter, astronomers have discovered a handful that co-orbit the sun with Neptune and Mars. 2010 TK7 isn't a threat to Earth. For one thing it's ahead of us, not behind us. And its current orbit brings it no closer than 20 million kilometers or so once every 395 years. Call it a partner for life, or at least for the next 5000 years, the period for which astronomers can reliably predict its chaotic orbit (which, relative to earth, is depicted in green loops). |
回复此楼» 猜你喜欢
论文撤稿了
已经有8人回复
-
博士申请
已经有7人回复
-
青B发送上会通知了吗
已经有8人回复
-
化学专业申博
已经有4人回复
-
售SCI一区T0P文章，我:8.O.5.5.1.O.5.4,科目齐全,可+急
已经有3人回复
-
评审有感
已经有27人回复
-
售SCI一区T0P文章，我:8.O.5.5.1.O.5.4,科目齐全,可+急
已经有4人回复
-
售SCI一区T0P文章，我:8.O.5.5.1.O.5.4,科目齐全,可+急
已经有3人回复
-
售SCI一区T0P文章，我:8.O.5.5.1.O.5.4,科目齐全,可+急
已经有3人回复
-
售SCI一区T0P文章，我:8.O.5.5.1.O.5.4,科目齐全,可+急
已经有5人回复
★
小木虫(沙发+1，金币+0.5):恭喜抢个沙发，再给个红包
小木虫(沙发+1，金币+0.5):恭喜抢个沙发，再给个红包
 |
2楼2011-09-11 22:47:57
★
小木虫(金币+0.2):抢了个小板凳，给个红包
小木虫(金币+0.2):抢了个小板凳，给个红包
 |
3楼2011-09-11 22:48:05
4楼2011-09-11 22:50:18
xia_chong
金虫 (文坛精英)
- ESEPI: 43
- 应助: 0 (幼儿园)
- 贵宾: 1.591
- 金币: 10270.8
- 散金: 2377
- 红花: 34
- 沙发: 160
- 帖子: 12455
- 在线: 1941.8小时
- 虫号: 804303
- 注册: 2009-07-06
- 性别: GG
- 专业: 粒子物理学和场论
- 管辖: English Cafe
5楼2011-09-12 09:34:05
 |
6楼2011-09-12 09:46:58
10