Some of us are Looking at the Stars

Astronomy Audio and Media

Astronomy Definitions and Factiods

Astronomy Definitions 4

nebula

A diffuse mass of interstellar dust and gas.

neutrino

A fundamental particle supposedly produced in massive numbers by the nuclear reactions in stars; they are very hard to detect because the vast majority of them pass completely through the Earth without interacting.

nuclear fusion

A nuclear process whereby several small nuclei are combined to make a larger one whose mass is slightly smaller than the sum of the small ones. The difference in mass is converted to energy by Einstein's famous equivalence E=mc2. This is the source of the Sun's energy and, ultimately, of (almost) all energy on Earth.

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