If a star that is 10 light-years away from Earth explodes, gravitational waves from the explosion will reach Earth in
A) less than 10 years.
B) more than 10 years.
C) 10 years.
Answer: C
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Why will a smaller body (the Moon, for example) cool much faster than a larger body like Earth?
A. A smaller body will have a smaller iron core, which holds heat better than rock. B. A smaller body has a larger surface area for heat to escape through, relative to its volume. C. A smaller body will have a smaller proportion of radioactive elements. D. A smaller body is less likely to have an atmosphere than a larger body.
In which part of the electromagnetic spectrum have astronomers been unable to get any information?
A) Gamma rays B) X-rays C) Ultraviolet D) Microwaves E) We now can access information in all spectral lengths.
Physicists today consider the Bohr model of the atom to be
A) an accurate picture of a hydrogen atom. B) totally useless — of historical interest only. C) oversimplified, but nevertheless useful.
Earth's albedo is ______________
Fill in the blank(s) with correct word