# 8. Which of these correctly compares the masses of different objects in the universe?

A moon has less mass than a star and more mass than the planet it orbits.

B A planet has less mass than a galaxy and more mass than the star it orbits.

C A galaxy has less mass than a moon and more mass than a planet.

D A star has less mass than a galaxy and more mass than a planet.

Ella is learning about different types of electro- magnetic radiation. She makes the following list about one frequency of radiation:· Can damage cells of living things · Blocked by Earth’s ozone layerWhich type of radiation does Ella’s list describe?

A Infrared

B Microwave

C Ultraviolet

D Visible

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## To compare the masses of different objects in the universe, we can analyze the given statements.

Option A states that a moon has less mass than a star and more mass than the planet it orbits. This statement aligns with our understanding that stars are typically much more massive than moons and planets, so Option A could be correct.

Option B states that a planet has less mass than a galaxy and more mass than the star it orbits. This statement is not accurate because galaxies contain billions of stars, which are much more massive than planets. Therefore, Option B is incorrect.

Option C states that a galaxy has less mass than a moon and more mass than a planet. Similar to Option B, this statement is incorrect. Galaxies are made up of billions or even trillions of stars and are much more massive than moons or planets.

Option D states that a star has less mass than a galaxy and more mass than a planet. This statement aligns with our understanding that galaxies are composed of many stars and are typically more massive than individual stars. Therefore, Option D could be the correct answer.

To determine which type of electromagnetic radiation Ella's list describes, we need to consider the given characteristics:

1. Can damage cells of living things: This rules out options like microwave and visible radiation, as they are generally not known to harm cells.

2. Blocked by Earth's ozone layer: This narrows the options down to either infrared or ultraviolet radiation, as these are the types of radiation that are primarily absorbed or filtered by the ozone layer.

Considering both characteristics, the correct answer is Option C: Ultraviolet radiation. It possesses the ability to damage cells and is indeed blocked to some extent by the ozone layer.

In summary, the correct answer to the first question is Option D, and the correct answer to the second question is Option C.

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