Day 7 STAAR Review

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 -

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

Two stars are identified on the HR Diagram below.

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

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?

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-

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?