Unit 2 Test Review

Carlos is studying a star system that appears to have two stars. Using a telescope, he discovers that one of the stars is actually two stars. With which other star system would he classify this system?

• Sun

• Mizar

• Polaris

• Castor

Astronomers use the light-year to describe the relationship between objects in space. Which of the following units is most similar to the light-year?

• gram

• second

• kilometer

• degree Celsius

A scientist finds a star that is located far from Earth. The star appears to have several smaller bodies orbiting it. The scientist draws a simple diagram of her findings. Which of these terms would the scientist use to describe her findings?

• a moon

• a planet

• a galaxy

• a solar system

Sofia chose three stars and listed the stars in order from smallest to largest. Which of the following shows how the stars’ names appeared on Sofia’s chart?

• KW Sagittarii, Betelguese, Pollux

• Betelguese, Sirius, Rigel

• Rigel, Antares, Sirius

• Pollux, Betelguese, KW Sagittarii

Tags

NGSS.MS-ESS1-3

The pie graph shows the elements that make up the sun by percentages of mass. Which element makes up most of the sun’s mass?

• hydrogen

• helium

• oxygen

Tags

NGSS.MS-PS1-1

For a school project, Kate is building a model of the solar system. In her model, Kate uses a tiny bead to represent Earth and a giant beach ball to represent the sun. Why did Kate choose a tiny bead to represent Earth and a giant beach ball to represent the sun in her model?

• the sun is brighter than Earth

• the sun is denser than Earth

• the sun is greater in size and mass than Earth

• because the sun is a gas giant planet and Earth is a terrestrial planet

Tags

NGSS.MS-ESS1-3

Anthony’s teacher posted the following chart on the wall of his classroom. The teacher asked the class to list various items from the chart in order from brightest to dimmest apparent magnitude. Which object should Anthony list first?

• Venus

• Full Moon

• Sirius

• Polaris

Felix examined several photos of stars. To compare their temperatures, he looked at the colors of the stars. He organized the photos in order from coolest to hottest. Which of these answers shows the correct order?

• red, yellow, white, blue

• white, blue, yellow, red

• blue, yellow, white, red

• yellow, white, blue, red

Galaxies are large groups of millions, billions, or even trillions of stars. What would you claim keeps the stars in a galaxy from moving away from each other?

• gravity

• density

• composition

• temperature

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Our solar system consists of eight planets. Which phrase correctly describes a planet?

• a large celestial body that is composed of gas and emits light

• any one of the primary bodies that orbits a star

• many stars held together by gravity

• space and all the matter and energy in it