If the Moon was twice as far away from the Earth as it is currently what would happen to total solar eclipses?
We would have more total solar eclipses.
Nothing would change.
We would have no total solar eclipses.
We would have a total solar eclipse every two years.
We would have no total solar eclipses.
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What observations demonstrate the existence of an interstellar medium?
What will be an ideal response?
Suppose it turns out that one in 1 million stars has a planet that at some point in its history is home to an advanced civilization. Then the total number of civilizations that have arisen in our galaxy would be closest to ________. Assume there are about 100 billion stars in the Milky Way galaxy.
A) 100,000 B) 10,000 C) 1,000 D) 100 E) 10 F) 1
The body which wiped out the dinosaurs was about:
A) as big as our Moon. B) as big as one of Mars' moons. C) a few hundred meters across. D) as big as a 747. E) as big as an SUV.
It is very cold, but otherwise comfortable. You breathe deeply. Although there is no oxygen, the air pressure is quite tolerable and seems almost Earth-like (because it is mostly nitrogen)
Your vista includes the breathtaking sights of an ocean of liquid methane and methane-snow-capped mountains (although the atmosphere is very smoggy, and the visibility is limited). Your solar day is about 16 Earth days long. A large, ringed object seems to hang in your sky, never rising or setting; however, it does go through phases from new to full and back to new again with the same 16-day period as the rising and setting of the Sun.