Exam 18: The Universe

One parsec is defined as the distance to a star when the star exhibits a parallax of what angle of arc?

The visible surface of the Sun is called the ______________.

The celestial equator is

Stars of what magnitude are just barely visible to the unaided eye?

In a star, the balance between the inward force of gravity and the outward force of thermal and radiation pressure is called

The cluster of galaxies that includes our Milky Way is called the ______________.

An extremely large collection of stars bound together by gravitational attraction and occupying a huge volume of space is called a _______________.

The angular measure in degrees north or south of the celestial equator is called _______________.

A Type II supernova can form a _______________ or a black hole.

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

The Sun is a(n) ______________.

The Sun has been on the main sequence

The Sun will finally become a

When the Sun moves off the main sequence, it will next become a(n) ______________.

When the Sun moves off the main sequence, it will next become a _______________.

The modification of the standard Big Bang theory is known as the

It is not true that right ascension is

The end stage of the life cycle of an extremely high-mass star is a

Proxima Centauri, the nearest star to the Sun, exhibits an annual parallax of 0.76 arcsec. Determine the distance to Proxima Centauri in parsecs.

White dwarfs are relatively