Find the orbital speed of an ice cube in the rings of Saturn. The mass of Saturn is 5.68 × 1026 kg and the rings have an average radius of 100,000 km. (G = 6.67 × 10-11 N • m2/kg2)
A) 19.5 km/s
B) 27.5 km/s
C) 13.8 km/s
D) 1.95 km/s
A
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What produces the 21-cm line that we use to map out the Milky Way Galaxy?
A) atomic hydrogen B) ionized hydrogen C) molecular hydrogen D) carbon monoxide E) helium
The close-packed planes in a FCC metal are the ______________ family of planes.
Fill in the blank(s) with the appropriate word(s).
In the simplified Drake equation, the total number of life-bearing planets in our galaxy is given by
A) NHP B) flife C) NHP × flife D) NHP / flife
A star is 10 parsecs from Earth. Which statement is true?
A) The star's apparent magnitude is larger than its absolute magnitude. B) The star is about 33 ly away. C) The star's parallax is 1.0 arc seconds. D) The star's apparent magnitude is smaller than its absolute magnitude. E) The star is in a different galaxy.