If we know the size of an asteroid, how can we determine its density?
A) comparing its reflectivity to the amount of light it reflects
B) looking for brightness variations as it rotates
C) determining its mass from its gravitational pull on a spacecraft, satellite, or planet
D) radar mapping
E) spectroscopic imaging
C) determining its mass from its gravitational pull on a spacecraft, satellite, or planet
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A taxicab moves five blocks due north, five blocks due east, and another three blocks due north. Assume all blocks are of equal size. How far is the taxi from its starting point?
a. 13 blocks c. 9.2 blocks b. 9.4 blocks d. 8.6 blocks
All elliptical galaxies are more massive than the largest spiral galaxies
a. True b. False Indicate whether the statement is true or false
Protostars can be observed in
A) the Crab Nebula. B) the Andromeda Galaxy. C) the Orion Nebula. D) our Solar System. E) the Helix Nebula.
The sidereal day is determined by the Earth's rotation with respect to the stars
Indicate whether the statement is true or false