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If there is life on another planet, what is it like? This is the question that a new science fiction (科幻) programme,Alien Planet(《异形星球》), tries to answer In the 94-minute programme, two robots explore(探索) a fictional planet. The planet, Darwin IV, has two suns, and is sm...
Kepler has discovered some interesting and unusual planetary systems. For example, most astronomers expected planets to be limited to single stars. But we have found planets orbiting close double stars, so that the planet would see two suns in its sky, like those of the fictional planet Tatooine...
Astronomers have just discovered the first "circumbinary planet." Like Luke Skywalker's home planet of Tatooine in the "Star Wars" films, this strange world, labeled Kepler-16b, orbits two closely spaced suns. What would such a planet be like? For that matter, what if Earth had two suns ...
it is impossible for life to exist on planetsB.earth-like life could only exist on a few planetsC.life could exist on only one planet in a millionD.life could exist on a great number of planets 3【题目】What do you do if your nation has asevere water shortage and happens to be ...
Doppler shift works because the wavelengths of light are shortened when a star is moving toward Earth, shifting it toward the blue end of theelectromagnetic spectrum, while light from a star moving away from our planet has its wavelength stretched, or "redshifted." ...
and potential nuclear winter won't come as the result of warring gods or cosmic mishap, but due to our own self-destructive tendencies. Once nomads in the primordial wilds, we've climbed a ladder of technology, taken on the mantle of civilization and declared ourselves masters of the planet...
47c, is about 4.5 times the size of the Earth. Most importantly, Kepler?47c is neither too close nor(既不……也不……) too far away from the stars. It means the planet won't be too hot or cold. So, scientists believe there could be water on it or even life....
If a planet has a period of 8 years, what is its average distance from the Sun, in astronomical units? Assume that the mass of the planet is small compared to the Sun and that the average distance from the Sun is the same as the semi-major axis. The Sun subtends an angle of a...
As the planet emerges again, heading toward us, its colors look blueshifted -- its emission wavelengths bunch up, shifting toward the blue end of the spectrum. Redshifting and blueshifting usually result from a stellar object moving away from us or toward us, respectively, much like the ...