Spectroscopy can be used to study

___ or "bright-line" spectra can be used to study the elemental composition of stars.

When electrons of an element reach an "excited" state, ___ lines are produced.

A ___ is used in astronomy to break down light like a prism.

Each element on the periodic table can be identified by its

Emission spectra emitted by an element (or compound) will produce ___ through a spectroscope.

The spectroscope is a powerful tool used by astronomers to infer the nature of matter.

Excited hydrogen gas forms a series of distinct bright spectral lines called absorption lines.

When an electron changes state it produces a proton.

By passing starlight light through a ___the light is spread out into its component colors.

After hydrogen is ___ - which is made up of two protons, two neutrons & two electrons.

___ produces many emission lines in the red-wavelengths & is used in lights.

A spectroscope may be connected to a ___ to record an object's spectra.

A ___ can be used in place of a prism in a spectroscope & is inexpensive.

If an object like a star is moving away from Earth, the spectral lines are observed to be

Spectral lines that are observed to be narrower & blue-shifted indicates that an object is