Exam 24: Stars, Space, and Galaxies

Which is the correct sequence of events that occurred during the evolution of the Universe?

A small residual star that emits regular, closely spaced electromagnetic signals is a/an __________.

When a star the size of our Sun dies, it will blow a ring of gas called a/an __________ __________ into space.

During a full solar eclipse, the __________ appears as a halo around the Sun.

The major reason for differences in temperature and luminosities among main-sequence stars is that some:

All main-sequence stars are composed primarily of __________ and __________.

A cloud of interstellar gas and dust is called a __________.

Originally, all of the stars in the Universe were composed of hydrogen and carbon.

The Sun is composed primarily of hydrogen and __________.

A __________ is a concentration of billions of stars held together by their mutual gravitation.

The mass of the Sun is one __________ __________.

A quasar:

A __________ is an object of less than 1 light-year in diameter and very distant from Earth that emits large amounts of radio wave energy.

Astronomers detected in the mid to late 1990s that the Universe in contracting.

The sunlight we see from Earth comes from the Sun's core.

The surface of the Sun that we see from Earth is the __________.

A red giant is cooler and brighter than a main-sequence star of the same mass.

The material remaining after the explosion of an average-size star will contract to become a/an __________ __________.

Different regions of the Sun have different temperatures. Which sequence of temperatures is correct, starting with the hottest region first?

Our Sun is a star of average mass.