Hot Jupiters were a surprise to astronomers. What is the current explanation for their existence?
A) Jupiters actually can form close to the host star, since they do not require as much hydrogen compounds and ice as originally thought.
B) The temperature of the hot Jupiters is highly uncertain, so they might not be as hot as the astronomers say.
C) Jupiters are supposed to form far away from their host star, and then they migrate closer through gravitational interactions with the protoplanetary disk.
D) Jupiters form as a companion to the host star, but fail to become actual stars themselves because they are not massive enough.
C
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Superposition of waves can occur
A. in transverse waves. B. in longitudinal waves. C. in sinusoidal waves. D. in all of the above. E. only in (a) and (c) above.
A constant net torque is applied to an object. Which one of the following will not be constant?
1.angular acceleration 2.angular velocity 3.moment of inertia 4.center of gravity
A 6.0-J pulse of light from a laser has what momentum?
a. Light does not have momentum because it doesn't have mass. b. 3.0 × 10^9 kg•m/s c. 6.7 × 10^–9 kg•m/s d. 2.0 × 10^–8 kg•m/s
X-ray bursts and gamma ray bursts have the same distribution pattern in the sky
Indicate whether the statement is true or false