BJU Earth Science Ch. 24 Review

(Fill-in-the-blank) Most binary star systems are not ___________ binary stars.

Who divided the stars into six different ranks of magnitude?

(Fill-in-the-blank) In general, any recognizable pattern of stars is called a(n)

Charles Messier's objective when cataloging and naming the nebulas was ____________.

Which of the following statements do not apply to most galaxies?

The largest galaxies known are elliptical galaxies.

According to the apparent magnitude given, which of the following stars is the brightest?

(Fill-in-the-blank) Stellar parallax is a method that astronomers may use to determine a star's ________ from the earth.

As a yellow dwarf, the sun lies on the main sequence of the Hertzsprung-Russell diagram.

All constellations are asterisms, but not all asterisms are constellations.

Who created an early catalog of non-stellar objects and used the letter M to identify them?

Who developed a system for naming stars that used Greek letters and Latin forms of the stars' constellation names?

(Fill-in-the-blank) Most astronomers agree that the Milky Way can be classified as a(n) ___________ galaxy.

Which two factors are used as the axes to plot stars on the Hertzsprung-Russell diagram?

(Fill-in-blank) When white dwarf gains enough matter from companion to create temporary nuclear explosion, a ____occurs.

Which pair of elements makes up the bulk of most stars, including our sun?

Astronomers believe that some black holes formed at the beginning or the universe but others are remnants of supernovas.

Who identified stars by their brightness within constellations?

(Fill-in-the-blank) Our own sun is found in the _______________ Galaxy.

(Fill-in-blank) A cloud of gas or dust that can be seen against a background of stars is called a(n) ____________.

(Fill-in-the-blank) The brightness of a star as it appears from Earth is its ___________ magnitude.

Globular star clusters are held together by gravity, but open clusters are not.

Which of the following properties is not characteristic of quasars?

Planetary nebulas, white dwarfs, and neutron stars _____________.

Astronomers believe that most of the stars in our galaxy are eclipsing binary stars.

When an astronomer first observes two stars close together in the sky, he can be sure that they ______________.

A star that has a diameter 100 times larger than our sun is classified as a giant.