Exam 18: The Universe

The name of which astronomer is most closely linked with that of Ejnar Hertzsprung?

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

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

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

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

The value for the total energy that reaches each square meter of Earth from the Sun each second is called the ______________.

The apparent path that the Sun traces annually along the celestial sphere is known as the ______________.

The angular measurement in hours,minutes,and seconds from the celestial prime meridian eastward is called ______________.

Patches of cooler material on the Sun's surface are called

By definition,the universe consists of

Our home galaxy is called the ______________.

Clusters containing clusters of galaxies are called ______________.

The color of a star reveals its

The imaginary,huge,apparently moving sphere on which the stars appear to be mounted is called the ______________ sphere.

The most distant known objects in space are called ______________.

Which of the following is an irregular galaxy that can be seen from the Southern Hemisphere?

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

The estimated number of stars in the Milky Way is about how many billion?

The cataclysmic explosion of a star that throws most of its matter into space is called a(n)______________.

A(n)______________ is equivalent to 3.26 light-years.