A special unit called a light-year is used to describe the relationship between objects in space. How long is a light year?

• 365 days

• 950,000 km

• 9.5 trillion days

• 9.5 trillion km

Tags

NGSS.MS-ESS1-3

The sun is much larger than the moon. However, as viewed from Earth, the sun and moon appear to be the same size. Which reasoning explains why the sun and moon appear to be the same size when viewed from Earth?

• The moon is much hotter than the sun

• The moon is much denser than the sun

• The moon is much brighter than the sun

• The moon is much closer to Earth than the sun

Tags

NGSS.MS-ESS1-1

When we say that an object is in orbit, we mean that it is traveling around another object in space. What do planets in the solar system orbit?

• A star

• A moon

• A galaxy

• A universe

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

NGSS.MS-PS2-5

An astronomer uses a telescope to observe a star. She observes that the color of this star is similar to the color of the sun. Therefore, she infers that the star and the sun have similar sizes and surface temperatures. Using this information, what can the astronomer conclude about the star?

• The star is a white dwarf

• The star is medium sized

• The star is hotter than most other stars in our galaxy

• The star is brighter than most other stars in our galaxy

Our solar system consists of eight planets. Each planet is classified as either a terrestrial planet or a gas giant planet. Which is a difference between these two types of planets?

• Terrestrial planets are larger than gas giant planets

• Gas giant planets are denser than terrestrial planets

• Terrestrial planets have thinner atmospheres than gas giant planets

• Gas giant planets have rockier crusts than terrestrial planets

Linda examined the sizes of several different stars. She listed them in order from smallest to largest. Which of the following stars would Linda list first?

• Polaris, 30 solar radii

• Aldebaran, 44.2 solar radii

• Sirius B, 0.008 solar radius

• Barnard's Star, 0.15 solar radius

Space exploration has advanced our knowledge of the universe. Which space journey would take the longest?

• a journey from Earth to the sun

• a journey from Earth to the moon

• a journey from Earth to a star in the constellation Centaurus

• a journey from Earth to Neptune, the farthest planet in our solar system

Tags

NGSS.MS-ESS1-3

The diameter of Saturn is nearly ten times that of Earth. However, the density of Saturn is much less than that of Earth. What is the reason for this?

• Earth is farther from the sun than Saturn

• Saturn has a ring system

• Earth is hotter than Saturn

• Saturn is a gaseous planet

Ashni is a member of the astronomy club. During a trip to an observatory, the members of the astronomy club observe several different stars. Ashni records information about some of the stars in her journal. Of the following four stars, which star should Ashni label as the hottest?

• Wolf, red

• Ceti, yellow

• Cygni B, orange

• Vega, blue-white

which of the following is larger than a galaxy?

• a star

• a planet

• the universe

• a solar system