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Which of the following units is used to express the size of stars?

• Kilometer

• Light-year

• Solar Radius

• Astronomical unit

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NGSS.MS-ESS1-3

The sun is made up of different elements. Which element makes up more than 70 percent of the sun?

• Carbon

• Helium

• Hydrogen

• Oxygen

Most scientists believe the Big Bang Theory explains which of the following questions?

• How our planets and moons formed

• How our universe began

• How the sun turns hydrogen into helium

• How fast light travels through space

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NGSS.HS-ESS1-2

The data table provides information on the distance and period of orbit for the inner planets.

Based on the pattern in the data, we can predict that the period of Mars’ orbit will be–

• less than 88 days.

• between 88 and 224.6 days.

• greater than 365.2 days.

• exactly two times 224.6 days.

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NGSS.MS-ESS1-2

NGSS.MS-ESS1-3

Which of the following best describes the formation of the solar system?

• The sun ejected rocky material which later went on to form the planets.

• A rotating disk of gas and dust was drawn together by the force of gravity.

• One very large planetary body broke apart into several smaller planets.

• Several stars of different masses cooled and formed the planets and the sun.

Tags

NGSS.MS-ESS1-2

Students are making a model of planetary motion. The students tie a tennis ball to a string. The string passes through a spool and is attached to a 1 kilogram mass. The mass pulls down on the string as the students spin the tennis ball around the spool. If the students wish to change the model to show what would happen if the sun had a greater gravitational pull, what change should they make?

• Spin the tennis ball at an increased speed

• Replace the 1 kg mass with a 2 kg mass

• Tie the tennis ball with a longer string

• Change the spool to a longer one

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Gravity is responsible for which of the following characteristics of a galaxy?

• The motion of the objects within it

• The size of its largest stars

• Its location within the universe

• The color of light it emits

Tags

NGSS.MS-ESS1-2

Earth and its solar system are a part of which of the following galaxies?

• Andromeda

• Black Eye

• Milky Way

• Cartwheel

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NGSS.MS-ESS1-2

What affects the strength of gravity

• Weight and Mass

• Mass and Distance

• Distance and Weight

• Mass and Force

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NGSS.MS-PS2-4

Explain how gravity influences the motion of planets in our solar system.

• Gravity causes planets to move in a straight line.

• Gravity keeps planets in orbit around the Sun.

• Gravity has no effect on the motion of planets.

• Gravity pushes planets away from the Sun.

Answer explanation

Gravity is the force that keeps planets in orbit around the Sun. It pulls them towards the Sun, preventing them from moving in a straight line and instead causing them to follow curved paths in their orbits.

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FL.SC.8.E.5.4