What are some advantages of radio telescopes over optical telescopes?
What will be an ideal response?
Radio telescopes can be used day or night, they are much less affected by cloudy skies, and they open a new window to observe the Universe. They allow us to observe astronomical objects at a different wavelength than an optical telescope, thus giving an opportunity to compare and contrast the images.
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Approximately how long does it take stars in our region of the Milky Way to complete an orbit around the center of the Milky Way Galaxy?
A) 20,000 years B) 200,000 years C) 2 million years D) 200 million years E) 2 billion years
The reason that small planets tend to lose interior heat faster than larger planets is essentially the same as the reason that
A) a large baked potato takes longer to cool than a small baked potato. B) gas bubbles form and rise upward in boiling water. C) Earth contains more metal than the Moon. D) thunderstorms tend to form on hot summer days.
The distance to the sun is about 150 million km. Expressed in powers of ten, this is
A) 1.5 × 106 km. B) 1.5 × 108 km. C) 1.5 × 10-8 km. D) 1.5 × 10-6 km. E) None of the above.
A box slides down a frictionless incline, and a hoop rolls down another incline. Both inclines have the same height, and both the box and the hoop have the same mass. If both objects start from rest, upon reaching the bottom of the incline which one will have the greater kinetic energy and which one will have the greater speed?
a. The box will have both the greater kinetic energy and the greater speed. b. The hoop will have both the greater kinetic energy and the greater speed. c. Both will have the same kinetic energy, but the hoop will have the greater speed. d. Both will have the same kinetic energy, but the box will have the greater speed.