Sec 30.3 Review

Has a nucleus of bright stars with arms that circle around it.

• Spiral galaxy
• Elliptical galaxy
• Irregular galaxy
• Quasar

Pairs of revolving stars that are held together by gravity.

• Tertiary stars
• Binary stary
• Barycenter stars
• Circumpolar stars

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

• Nebula
• Planetary Nebula
• Galaxy
• Pulsar

 Has no particular shape.

• Globular cluster
• Spiral galaxy
• Elliptical galaxy
• Irregular galaxy

 A star that brightens and fades in a regular pattern.

• Cepheid variable
• Quasar
• Pulsar
• Neutron star

Can be spherical to very elongated.

• Spiral galaxy
• Elliptical galaxy
• Irregular galaxy
• Large Magallenic cloud

What does quasar stand for?

• Quad-stellar radiation source
• Quasi-super reality source
• Quasi-stellar radio source
• Quasi-sterile rally source

The center of mass between stars that revolve around each other.

• Black hole
• Quasar
• Pulsar
• Barycenter

Group of stars organized into a pattern and the region of space around them.

• Constellations
• Galaxies
• Solar systems
• Star systems

What does the energy emitted by a Quasar suggest?

• The quasar is close to Earth
• The presence of a giant black hole
• The quasar is red-shifted
• The quasar is blue-shifted