One possible ingredient of dark matter is known as WIMPs, or weakly interacting massive particles. Our best guess is that WIMPs probably are made of protons and neutrons
Indicate whether the statement is true or false
FALSE
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The half-life of a muon is 2.2 ?s. How fast is it moving relative to an observer who says its half-life is 4.4 ?s?
a. 0.87 c b. 0.75 c c. 0.97 c d. 0.72 c e. 0.50 c
Why isn't there a planet where the asteroid belt is located?
A) There was not enough material in this part of the solar nebula to form a planet. B) A planet once formed here, but it was broken apart by a catastrophic collision. C) Gravitational tugs from Jupiter prevented material from collecting together to form a planet. D) There was too much rocky material to form a terrestrial planet, but not enough gaseous material to form a jovian planet. E) The temperature in this portion of the solar nebula was just right to prevent rock from sticking together.
The striking gap between Saturn's A and B rings is called the ________
Fill in the blank(s) with correct word
One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s (3 × 105 km/s). How far is 1 light-year?
A) 3 × 105 km B) 1.8 × 107 km C) 1.08 × 109 km D) 9.46 × 1012 km