The first elements to form at the beginning of the universe were 92% hydrogen and 8% helium, with the exception of a very small amount of lithium. The remaining elements were formed by stellar nucleosynthesis. That is, by the fusion...
Mariner 10 was the first spacecraft to be launched to study Mercury on November 3, 1973Launched by NASA, this robotic spacecraft was the first spacecraft to fly over multiple planets. What is a fly-by or gravity assist? This is a...
The day of the first recorded solar eclipse, according to belief, was predicted by the Greek philosopher Thales. It is believed that on May 28, 585 B.C., the solar eclipse occurred, and Thales had foretold this event beforehand. Thales is...
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