Fragmenting during meteorite impacts caused the breccias found among the lunar samples
Indicate whether the statement is true or false
T
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Radioactive Decay: Plutonium has a half life of 2.4 × 104 years. How long does it take for 99.0% of the plutonium to decay?
A. 1.6 × 102 y B. 1.6 × 103 y C. 1.6 × 104 y D. 1.6 × 105 y E. 1.6 × 106 y
If an elephant grows proportionally to twice its height, the area of its ears would be about
A) twice. B) four times more. C) six times more. D) eight times more. E) none of the above
How do X-ray measurements help us measure the amount of dark matter in galaxy clusters?
A) X-rays are emitted by hot gas, and the intracluster gas is heated by collisions with dark matter particles. More dark matter leads to greater heating, and hence stronger X-ray emission. B) Dark matter absorbs X-rays. Therefore, more dark matter leads to weaker X-ray emission from galaxy clusters. C) X-rays are emitted by hot gas, and the intracluster gas is heated by the gravitational effects of dark matter. More dark matter leads to greater heating, and hence stronger X-ray emission.
__________ are produced when two galaxies pass near each other and pull large streamers of stars, gas, and dust away from the galaxies
a. Ring galaxies b. Spiral galaxies c. Rotation curves d. Tidal tails e. Irregular galaxies