A cloud fragment too small to form a star becomes:
A) a red giant.
B) a black hole.
C) a brown dwarf.
D) a T Tauri object.
E) a Herbig Haro object.
C
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A teaspoonful of neutron star material on Earth would weigh
A) about the same as a teaspoonful of Earth-like material. B) a few tons. C) more than Mt. Everest. D) more than the Moon. E) more than Earth.
A spacecraft can gain energy by passing near a planet
a. True b. False Indicate whether the statement is true or false
Ohm's Law: What potential difference is required across an 8.0-? resistor to cause 2.0 A to flow through it?
Fill in the blank(s) with the appropriate word(s).
The radio lobes that are on each side of some radio galaxies and jets from them produce mainly
a. 21-cm radiation. b. synchrotron radiation. c. black body radiation. d. emission lies due to hydrogen. e. absorption lines due to hydrogen.