Unit 2 Review - The Universe

Front

What can an astronomer infer about a star if its color is similar to that of the sun?

Back

The star is medium sized and has a similar surface temperature to the sun.

Front

What is a light-year and how long is it in kilometers?

Back

A light-year is the distance that light travels in one year, which is approximately 9.5 trillion kilometers.

Front

What is larger than a galaxy?

Back

The universe is larger than a galaxy.

Front

Which star is the smallest when comparing sizes of stars?

Back

Sirius B, with a size of 0.008 solar radius, is the smallest.

Front

Which star is considered the hottest based on color?

Back

Vega, which is blue-white, is considered the hottest star.

Front

What is the significance of a star's color in determining its temperature?

Back

A star's color indicates its temperature; blue stars are hotter, while red stars are cooler.

Front

What is the relationship between a star's size and its surface temperature?

Back

Generally, larger stars have higher surface temperatures, but this can vary based on other factors.

Front

What unit is used to measure astronomical distances?

Back

The light-year is the unit used to measure astronomical distances.

Front

How do astronomers classify stars based on their sizes?

Back

Astronomers classify stars into categories such as dwarf stars, medium stars, and giant stars based on their sizes.

Front

What is the approximate distance of one light-year in miles?

Back

One light-year is approximately 5.88 trillion miles.