Exam 18: The Universe

Another name for a pulsar is _______________.

Astronomers believe that most of the matter that makes up the universe is not detected by any part of the electromagnetic spectrum. This mysterious matter is called ______________.

What is the temperature in kelvins of the visible surface of the Sun?

The majority of stars are small, cool, type-M stars called

The Sun's photosphere is, by mass, about 75%

If the magnitude difference between one star and another is 5, the stars differ in brightness by a factor of

The Sun's photosphere is, by mass, about 25%

The apparent motion of an object when it is viewed from two different positions against a fixed background is called

A star of magnitude 2 is how many times brighter than a star of magnitude 4?

When the term singularity is mentioned, the object under discussion is probably a

On the H-R diagram, the Sun lies on the ______________.

The number of ______________ appearing on the Sun varies over an 11-year cycle.

The celestial prime meridian is an imaginary half-circle running from the north celestial pole to the south celestial pole and crossing perpendicular to the celestial equator at the point of the

Another name for a pulsar is ______________.

The Andromeda Galaxy (M31) is what type?

Stars lying above the main sequence that are relatively cool but very bright are called

Eighty-eight prominent groups of stars in the sky are called the _______________.

The greater the mass of a star, the ______________ it moves through its life cycle.

The cataclysmic explosion of a star that throws most of its matter into space is called a _______________.

A(n) ______________is denser than a neutron star.