What kind of "spark" is the molecular cloud awaiting?
A: B, C, or D are possible
B: cooling until the cloud cannot support itself
C: a wind from a nearby massive star
D: a pressure wave from a nearby supernova
E: none of the above
Ans: A: B, C, or D are possible
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_________is a composite with a matrix of bitumen and particles of aggregate.
Fill in the blank(s) with the appropriate word(s).
Which of the Galilean moons has its own magnetic field?
A. Ganymede B. Io C. Callisto D. Europa E. None of these choices is correct.
A spaceship enters the solar system moving toward the Sun at a constant speed relative to the Sun. By its own clock, the time elapsed between the time it crosses the orbit of Jupiter and the time it crosses the orbit of Mars is 50.0 minutes
How fast is the spaceship traveling towards the Sun? The radius of the orbit of Jupiter is 778 × 109 m, and that of the orbit of Mars is 228 × 109 m. A) 0.522c B) 0.438c C) 0.319c D) 0.982c E) 0.671c
Why doesn’t the melting of ocean-based ice raise as much concern and the melting of land-based ice?
1.Unlike land-based ice, ocean-based ice already displaces water, so when it melts ocean levels won’t change much. 2.Because ocean-based ice is in the oceans, it will affect the level of the oceans much more than land-based ice. 3.Both ocean-based ice and land-based ice raise the same level of concern.