Which of these objects is the largest?

Scientists once believed that the structure of the universe had changed very little. Which statement best supports the theory that the universe is constantly changing?

In 2004 the Hubble space telescope captured images of distant star clusters, each containing about a million stars. These star clusters were most likely part of which structure?

Astronomers measure distances using very large units called light years. Which distance between celestial objects would most likely be measured in light years?

A student observes a glowing band across the night sky. This glowing band is most likely

What type of galaxy is the Milky Way?

Structures in the universe are grouped into large systems, each of which are made up of smaller systems. Which of the following is the largest system of which Earth is only a very small part?

An object has passed near Earth many times on a cycle that repeats about every 75 years. Which statement best describes this object?

Great distances in space are measured in

Phobos is one of two large objects that orbit the planet Mars. Because Phobos orbits Mars, Phobos should be classified as which type of body?

Which gas present in the atmosphere of Mars is the primary gas found in the atmosphere of Earth?

12. How many times does the Moon rotate on its axis during a lunar month?

The Moon is in orbit around Earth. What keeps the Moon from changing its orbit?

The planets in the Solar System revolve around the Sun because the Sun is

Which of the following allows the planets to stay in orbit?

A “shooting star” is

Which of these locations in the solar system contains the most asteroids?

Over the past few centuries, comets have occasionally been observed in the sky. What is one difference between comets and the Moon?

Which of these best describes when a lunar eclipse will occur?

Which moon phase occurs approximately 14 days after a full moon

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