Question: How fast does the sun travel around the center of the galaxy?
Incorrect Answer
Correct Answer Although it takes more than 10,000,000 years for the sun to make one circuit of the galaxy, the galaxy is so large that it must travel at almost 150 miles/second to cover the distance in that time.
Correct Answer A brown dwarf is a star-like body that is too light to have enough density in its center to transform hydrogen into helium. It may transform lithium, beryllium, and boron that can be transformed at lower temperatures and densities. The difference between a brown dwarf and a planet is harder to define observationally. Normally, it is considered that a planet is created by the accretion of material around a star that has already formed. A brown dwarf can form independently of another star.
Question: How long has light traveled from the most distant galaxy we have observed?
Incorrect Answer
Correct Answer A galaxy has recently been observed with a red-shift of 4.9. That means that the light we observe today has a wavelength 4.9 times its original wavelength. This is a result of the expansion of the universe. The exact distance to which this corresponds depends on details of the universe that we do not yet know. However, the distance is probably within a factor of 2 or 3 of 20,000,000,000 light years.
Question: Where do most of the known asteroids orbit the Sun?
Incorrect Answer
Correct Answer The so-called "Asteroid Belt" lies between the orbits of Jupiter and Mars. Most of the known asteroids, including most of the large asteroids are found in this region of the Solar System.
