S&S Astronomy

2. A highly magnetized rotating neutron star or white dwarf that emits a beam of electromagnetic radiation.
5. A distant, point-like energy source originating from a powerful active galactic nucleus.
8. - A substellar object that is too low in mass to sustain the nuclear fusion of hydrogen-1 in its core.
9. A concentration of mass so compact that it creates a region of space from which not even light can escape.
10. - The common center of mass about which any two or more bodies of a gravitationally bound system orbit.
11. - A type of compact star that is composed almost entirely of neutrons.
13. The smallest and coolest kind of star on the main sequence.

1. The gravitationally curved trajectory of an object around a star or a natural satellite around a planet.
3. The most massive stars.
4. A star system consisting of exactly two stars orbiting around their common barycenter.
6. A large, gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter, each of which orbits a center of mass.
7. A type of stellar remnant composed mostly of electron-degenerate matter.
12. A very large star of high luminosity and low surface temperature.