These stars are plotted on the upper right side of the H-R diagram.

The smallest of all star groupings, consisting of only two stars orbiting around a single center of gravity.

The apparent shift in motion of an object due t the motion of the observer.

These stars run from the upper left of the H-R diagram to the lower right,

A scatter plot showing the relationship between the luminosity and temperature of stars. (Full name).

These stars have a low luminosity but are very hot

These groups of stars are named after animals, mythological creatures, or everyday objects.

A unit of distance larger than the light year.

These stars fuse hydrogen in their core.

Color correlates with which variable on the H-R diagram?

These stars are plotted on the upper left of the H-R diagram.

Loosely organized groups of stars that are not densely packed.

How bright a star would appear if it were placed at a distance of 10 parsecs.

These stars are very bright but "cool"

A parsec equals how many light years?

The Sun falls into this category on the main sequence.

Made from densely packed groups of stars that are the same age. Their gravities hold them together in a rounded cluster.

How bright a star appears in the night sky.

This variable represents the x-axis on the H-R diagram.

When measuring parallax, when the distance of a star increases from Earth, the angle __________.

About 90% of all stars fall into this category on the H-R diagram.

A group of stars which are gravitationally bound.

The energy output from the surface of a star per second.

This variable represents the y-axis on the H-R diagram.

The apparent magnitude of Venus is -4. The apparent magnitude of Sirius is -2. Which is brighter?