Unit 9: Galaxies

Front

Galaxy

Back

A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.

Front

Neutron Star

Back

A star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons.

Front

Pulsar

Back

A highly magnetized, rotating neutron star or white dwarf, that emits a beam of electromagnetic radiation.

Front

Black Hole

Back

A region of space having a gravitational field so intense that no matter or radiation can escape.

Front

Singularity

Back

A point in which matter is infinitely dense, as in the center of a black hole or the universe at the very beginning.

Front

Quasar

Back

A massive and extremely remote celestial object, emitting exceptionally large amounts of energy, and typically having a starlike image in a telescope.

Front

Dark Matter

Back

Matter that does not give off electromagnetic radiation but is quite abundant in the Galaxies.

Front

Space

Back

The dimensions of height, depth, and width within which all things exist and move.

Front

Time

Back

The infinite series of points of existence and events in the past, present, and future.

Front

General Relativity

Back

The geometric theory of gravitation that explains gravity as not a force, but as the manifestation of space and time warping due to heavy objects.