E of the Universe Online Lesson Quiz How do you know that the sun is many thousands of times closer to Earth than any other star?
A. Because the sun is less than 1 light-year away
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B. Because Proxima Centauri is Earth's next nearest star
C. Because the next closest star is 4.3 light-years away
D. All of the other answer choices

When a scientific theory has been tested and proved by the scientific community, it becomes a law

One of the hopes for solving the world's energy problem is to make use of the fusion reaction 21h +31h --> 42he + 10n + energy how much energy is released when 1 mol of deuterium is fused with 1 mol of tritium according to the above reaction? the masses of the atoms and the neutrons are as follows: 21h = 2.0140 amu 31h = 3.01605 amu 42he = 4.002603 amu 10n = 1.008665 amu. the speed of light is 2.9979 x 108 m/s.

How many grams are in 68.2 molecules of br2?