How much of the solar system's mass is in the Sun?
The Sun contains about 99.8% of all the mass in our solar system.
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- How long is a year on Mars?
“A year on Mars is about 687 Earth days.”
Reference: NASA
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Why is Mars red?
Mars is red because of iron oxide, or rust, on its surface.
How many sunrises do astronauts on the ISS see each day?
The International Space Station orbits Earth about every 90 minutes, so astronauts see about 16 sunrises a day.