Exam 18: The Universe

The closest star to the Sun is named _______________.

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

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

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

A point in the universe where the density of matter and the gravitational field are theoretically infinite is called a _______________.

In a star,the condition of balance between the inward force of gravity and the outward force of thermal and radiation pressure is known as ______________ equilibrium.

According to the ______________ theory,the universe began from a single point 13.7 billion years ago.

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

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

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

The longest diameter of the Milky Way is about how many light-years?

Which of the following is thought to be a black hole?

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

A star of magnitude 1 appears ______________ times brighter than a star of magnitude 2.

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

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

The name of which astronomer is most closely linked with that of Henry Russell?

The dying glow of the Big Bang is called the ______________.

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

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