浩雲 wrote:
未來的地球人回到現在...(恕刪)
這也是我常常想到的一點
畢竟科技再發展下去
未來的哪天或許也會發明了時光機
不過又有論點說，
要回到過去只能回到時光機啟動的那一刻
所以這個假設也不知道行不行得通
宇宙這麼大，我們了解的，
或許就跟人類存在於宇宙一般的渺小
airjim wrote:
"繞日運行小天體2010 KQ 疑人造物體" ________________________
非常奇特 ? 消息來源 ???
Related topic on Google
這兩天NASA突然承認日前由英國發現的2010 KQ天體確實是"人造物體"而不是小行星, 且"它"軌道正在接近地球, 並會掠過地球 ???
NASA authorities report that an unknown object approaching the Earth from deep space is almost certainly artificial in origin rather than being an asteroid. Object 2010 KQ was detected by the Catalina Sky Survey in Arizona earlier this month, and subsequently tracked by NASA's asteroid-watching service, the Near-Earth Object Program headquartered at the Jet Propulsion Laboratory in California.
Observations by astronomer S J Bus, using the NASA-sponsored Infrared Telescope Facility in Mauna Kea, Hawaii, indicate that 2010 KQ's spectral characteristics do not match any of the known asteroid types, and the object's absolute magnitude (28.9) suggests it is only a few meters in size.(幾公尺大 ?)
The mysterious artificial object has apparently made a close pass by the Earth, coming in almost to the distance of the Moon's orbit, and is now headed away again into the interplanetary void. The object has used no propulsion during the time NASA has had it under observation. However the spacewatch experts believe that it must have moved under its own power at some point, given its position and velocity.(有自己的動力來源 ??)
"The orbit of this object is very similar to that of the Earth, and one would not expect a object to remain in this type of orbit for very long," said Paul Chodas, at JPL.
The experts believe that the object must be a spacecraft, or part of one - likely to be a booster stage from an interplanetary mission of the past, now drifting back in to Earth and out again. The next visit will probably be 2036, at which time there's a small chance that 2010 KQ will crash into the atmosphere and burn up.
The NASA graphic above shows the trajectory of the near-Earth object known as 2010 KQ, which the space agency said is likely a spent rocket stage that escaped the Earth-moon system years ago, and not an asteroid.
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