Astronomy

A collection of star systems

The distance that light travels in a vacuum in 1 year

Layer just outside the sun’s core, where energy is transported mostly in the form of radiation

Outermost layer of the sun’s interior

The intensely luminous surface of a star (especially the sun)

A gaseous layer of the sun’s atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun

A sudden eruption of intense high-energy radiation from the sun’s surface

A stream of protons moving radially from the sun

An atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth’s magnetic lines of force

A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy

An immense cloud of gas (mainly hydrogen) and dust in interstellar space

A star that expands and cools once it runs out of hydrogen fuel

Massive explosion of unstable high mass star

A faint star of enormous density

A star that has collapsed under its own gravity

Gravitational field so intense light cannot escape; end of a very massive star

A pattern of stars arranged as a mythical figure or animal

Are part of constellations. The Big Dipper is just part of the constellation Ursa Major

Created laws of planetary motion

The change in direction of the Earth’s axis

When the sun is above and below the horizon an equal amount of time

The view that the earth is the center of the universe

The type of eclipse that occurs when it is sun, moon, earth

The day with the least hours of sunlight

Eclipse when it is sun, earth, moon

Any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) and are too small to be called planets

Large meteors that reach the earth’s surface and hit the surface

Frozen chunks of rocks and metallic particles that orbit the sun in long elliptical paths

A starlike object that may send out radio waves and other forms of energy

A unit of measure equal to the mass of the sun