1st Hour Ch 26 Vocab Flashcard

Front

Scientific study of the universe

Back

Astronomy

Front

A collection of stars, dust, and gas bound by gravity.

Back

galaxy

Front

Avg. distance from Earth to Sun: ~150M km

Back

Astronomical Unit

Front

All frequencies or wavelengths of electromagnetic radiation.

Back

electromagnetic spectrum

Front

Instrument that collects and concentrates electromagnetic radiation from the sky.

Back

telescope

Front

Telescope using lenses to focus light from distant objects.

Back

Refracting telescope.

Front

A telescope using a curved mirror to focus light from distant objects.

Back

reflecting telescope

Front

Spin of a body on its axis

Back

rotation

Front

Motion of a body traveling around another in space.

Back

revolution

Front

Closest point in a planet's orbit to the sun.

Back

perihelion