Galaxies and the Universe

Front

What is a nebula?

Back

A nebula is a giant cloud of gas and dust in space, where new stars are born.

Front

What is a galaxy?

Back

A galaxy is a large grouping of stars, dust, and gas bound together by gravity.

Front

What type of galaxy has a spiral shape?

Back

A spiral galaxy is characterized by its spiral arms and a central bulge.

Front

What is an elliptical galaxy?

Back

An elliptical galaxy is a type of galaxy that has an oval shape and lacks the distinct arms of spiral galaxies.

Front

What is the H-R diagram?

Back

The H-R diagram (Hertzsprung-Russell diagram) is a scatter plot of stars showing the relationship between their absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

Front

What type of star is Barnard's star?

Back

Barnard's star is a red dwarf star, which is cool, dim, and has a low luminosity.

Front

What are radio waves?

Back

Radio waves are a type of electromagnetic radiation with the longest wavelength and the lowest frequency.

Front

What is a supernova?

Back

A supernova is a powerful and luminous explosion that occurs at the end of a star's life cycle.

Front

What is a protostar?

Back

A protostar is an early stage in the formation of a star, where gas and dust are collapsing under gravity.

Front

What is cosmology?

Back

Cosmology is the scientific study of the large scale properties of the universe as a whole.