The magnitude telling the actual brightness of a star.
The magnitude telling the brightness of a star as viewed from Earth.
The distance light travels in one year.
A star that explosively increases in brightness.
A source of regular radio pulses.
The theory for the origin of the universe.
Two stars revolving around a common center of mass.
A massive star that has collapsed to an area of extreme gravity, such that light cannot escape.
A cloud of dust and gas in space.
A collapsing cloud of gas and dust on its way to becoming a star.
A star of extremely high density.
A large, cool, bright star.
A VERY large, VERY bright, cool star.
An exploding star that increases in brightness many thousands of times.
A star that has exhausted most of its nuclear fuel and is believed to be near its final stage.
the apparent change in position of a distant object
a stable star that is undergoing hydrogen fusion
a diagram showing the relationship between temperature and absolute magnitude
produced by a light source that is moving away from the observer
the more distant a galaxy, the faster it is moving away
a galaxy made of young and old stars
a galaxy made of young stars
a galaxy made of old stars
the name of the galaxy our solar system is in
a group of galaxies held together by gravity