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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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.
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).
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