Exam 18: The Universe

The Sun remains stable because the inward pull of ______________ balances the outward push from nuclear fusion.

The explosion of a Type II supernova leaves behind

What type of nebula is the Horsehead?

The absolute magnitude of a celestial object is the apparent magnitude it would have if it were placed how far from the Earth?

One ______________ is defined as the distance to a star when the star exhibits a parallax of one second of arc.

The stars of highest photospheric temperature are those of spectral class _______________.

When the absolute magnitudes, or brightnesses, of stars are plotted against their surface temperatures or colors, we obtain a(n) ______________ diagram.

Antiquity's greatest observer of stars was named

Familiar groups of stars that are parts of a constellation or parts of different constellations are called

Taurus the Bull is a(n)

The universe seems to be about how many years old?

"All distant galaxies are moving away from us, and the farther away a galaxy is from us, the faster it is moving" is a statement of ______________ law.

A point in the universe where the density of matter and the gravitational field are theoretically infinite is called a(n) ______________.

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

The Sun is a

If the magnitude difference between one star and another is 8, the stars differ in brightness by a factor of

Which of the following is not a name used in the classification of galaxies?

A star of magnitude 0 is how many times brighter than a star of magnitude 6?

The Sun is a(n)

Celestial latitude is called