Astronomy and Atmospheric Terms

Front

Apparent

Back

Clearly visible or understood; obvious.

Front

Atmosphere

Back

The envelope of gases surrounding the earth or another planet.

Front

Horizon

Back

The line at which the earth's surface and the sky appear to meet.

Front

Light ray

Back

A line or stream of light that travels in a straight path.

Front

Medium

Back

something that energy, such as light, can pass through

Front

Orbit

Back

The curved path of a celestial object or spacecraft around a star, planet, or moon.

Front

Outer space

Back

Everything beyond Earth's atmosphere

Front

Refraction

Back

The bending of a wave when it enters a medium where its speed is different.

Front

Sunrise

Back

The time in the morning when the sun appears or full daylight arrives.

Front

Sunset

Back

The time in the evening when the sun disappears or daylight fades.