A. It has a supermassive black hole at its center. B. It is a spiral - shaped galaxy. C. All the stars in it are of the same age. D. It contains dust and gas clouds. 相关知识点: 试题来源: 解析 C。解析:银河系是一个巨大的星系,它的中心有一个超大质量黑洞,它是螺旋状星系,并且包...
a跟你聊天累~~~不聊了! Chats tired ~~~ with you not to chat![translate] aThere are approximately 100 million stars in the Milky Way. Which expression represents this number of stars? 有大约100百万个星用银河。 哪个表示代表星的这个数字?[translate]...
Planets Outnumber Stars in Milky Way, Astronomers SayWASHINGTON - The more astronomers look for other worlds, the morethey find that it's a crowded...Borenstein, Seth
N* is the total number of stars within the galaxy fL is the percentage of those stars that are at least 5 billion years old fHZ is the percentage of those stars which host a suitable planet for supporting life fM is the percentage of those stars with sufficient metallicity, allowing for a...
An upcoming NASA mission could find that there are more rogue planets—planets that float in space without orbiting a sun—than there are stars in the Milky Way, a new study theorizes.
根据下文“For example, when an exoplanet moves between its star and us, it causes a small drop in the star’s brightness. Measuring this drop is the transit (凌日) method of discovery. NASA’S Kepler space telescope has discovered many exoplanets this way.”(例如,当一颗系外行星在它的恒星...
* The Milky Way contains numerous binary stars, each consisting of two stars orbiting each other. Binary has many uses, most of them in technical terms. Most computers, for example, are based on the binary number system, in which only two digits, 0 and 1, are used. (0 stands for a ...
So far, only a small part of our galaxy, the Milky Way, has been explored. 2 Because exoplanets are so far away and very close to stars, it is very difficult to see them directly. 3 For example, as a planet circles a star, it pulls on it and causes it to shake. As the ...
Nomad planets in Milky Way may outnumber stars and carry life Gravitational microlensing data suggest our galaxy may be awash with nomad planets, wandering in space far from host stars. Researchers at the Kavli Instit... S Bowler - 《Astronomy & Geophysics》 被引量: 0发表: 2012年 Galaxy ...
A correlation of X-ray source and H_alpha emission-line object catalogues in the Small Magellanic Cloud (SMC) shows that more than two thirds of the optically identified Be stars in Be/X-ray binaries are found as emission-line objects in the catalogues. On the basis of this result we pro...