31 October 2021
宇航員首次發現銀河系外行星證據。
Astronomers say they have found evidence for the first time of a planet orbiting a star outside our Milky Way galaxy.
該證據是由美國宇航局的"Chandra X-ray Observatoy"的望遠鏡觀察的，它是世界上最強的X射線望遠鏡。
The evidence was observed by a telescope operated by the American space agency NASA. It is called the Chandra X-ray Observatory. NASA says the orbiting observatory is the world's most powerful X-ray telescope.
NASA最近宣告可能在太銀河系中發現一個著名的M51即"whirlpool"的新行星，研究釋出在自然天文學上。該行星被認為是外行星。他執行在太陽系外。
NASA recently announced that the observatory might have discovered a new planet in the galaxy known as Messier 51 or M51. The galaxy is popularly known as the "Whirlpool" galaxy. The research recently appeared in the publication Nature Astronomy.
The possible planet is considered an exoplanet. These are planets that orbit a star outside of our own solar system.
NASA說到目前為止已發現和被確認4500顆外行星。還有數千顆外行星待進一研究和檢測。
NASA says that so far, more than 4,500 exoplanets have been discovered and are considered "confirmed." Thousands of other "candidate" exoplanets have been detected, but require additional study.
但是所有這些已在銀河系中被觀測的行星幾乎距地球在3000光年內。
But all of these have been observed in the Milky Way galaxy. And NASA says almost all of them are "less than about 3,000 light-years from Earth."
科學家估計外行星M51距地球比其他已發現的遠多了，它距地球約兩千八百萬光年。
Scientists estimate that an exoplanet in the M51 galaxy would be much farther, about 28 million light-years away.
