Day 7 STAAR Review

Day 7 STAAR Review

Multiple Choice

The HR Diagram shows how the Sun is classified among the stars.

A star that is several thousand times brighter than the Sun with a temperature lower than 4000 K would be classified as -

• a main sequence star in spectral class B

• a super giant in spectral class K

• a main sequence star in spectral class K or M

• a white dwarf in spectral class B

Multiple Choice

The universe has many different components. Which list places four components of the universe in the most likely order from smallest to largest?

• planets, stars, galaxies, nebulae

• nebulae, stars, planets, galaxies

• galaxies, stars, planets, nebulae

• planets, stars, nebulae, galaxies

Multiple Choice

Two stars are identified on the HR Diagram below.

Based on this diagram, how do the characteristics of Star 1 and Star 2 compare?

• Star 1 is cooler and less bright than Star 2

• Star 1 is hotter and brighter than Star 2

• Star 1 is cooler and brighter than Star 2

• Star 1 is hotter and less bright than Star 2

Multiple Choice

With the use of the Hubble Space Telescope, scientists recently discovered a giant runaway star. It is 90 times larger than the Sun and is very hot and blue-white in color. Why does the Sun appear to be brighter than this runaway Star when viewed from Earth?

• The sun is a different color than the runaway star

• The sun is older than the runaway star

• The sun is closer to earth than the runaway star

• The sun is made of different elements than the runaway star

Multiple Choice

Quasars are extremely distant celestial bodies. Investigators using a special telescope determined that a certain quasar was emitting waves with a frequency of 1.41 x 10^9 Hz. An EM spectrum is shown.

The investigators were most likely using a telescope that detects-

• microwaves

• visible lights

• x- rays

• gamma rays

Multiple Choice

The model shows the star Wolf 359, the Sun, and Star X. It takes 7.8 years for light produced on Wolf 359 to reach the Sun.

If Star X is 50 times as far from the Sun as Wolf 359 is, how far is Star X from the Sun, to the nearest light year?

• 39.0

• 7.8

• 789

• 390