An extremely large collection of stars bound together by gravitational attraction and occupying a huge volume of space is called a _______________

a. planetary nebula
b. solar system
c. universe
d. galaxy


d

Physics & Space Science

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Astronomers have discovered more planets around other stars than in our Solar System

Indicate whether the statement is true or false

Physics & Space Science

In a laser

a. light is amplified by stimulated emission of radiation b. the emitted light is monochromatic c. the emitted light is coherent d. there is a population inversion of electrons in atoms e. all of the above

Physics & Space Science

In most months, there are no eclipses

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be 3 times the change in length of the Pyrex glass rod

a. True b. False Indicate whether the statement is true or false

Physics & Space Science