Science Unit 3 Review

Planets are classified as either inner planets or outer planets based on their distance from the sun. What is found between the inner and outer planets?

• asteroids

• comets

• moons

• stars

Pluto was once called a planet, but in 2006 it was reclassified. What term best describes Pluto?

• moon

• asteroid

• dwarf planet

• meteor

During a visit to an observatory, Mrs. Zachea observed the moon, Venus, the sun, and the star Sirius. Which of these objects is outside of our solar system?

• moon

• Venus

• sun

• Sirius

Which of the following planets has a large solid core?

• Jupiter

• Mercury

• Neptune

• Saturn

Elliptical galaxies are brightest towards the center. Which of these statements best explains why.

• The stars are evenly distributed throughout the galaxy.

• The stars ore located on the outer edge with dust clouds in the center.

• The brightest star is always at the center of the galaxy.

• The center is crowded with stars, the number of stars decreases further out.

What term do scientist use to describe a galaxy without a defined shape?

• barred spiral galaxy

• elliptical galaxy

• irregular galaxy

• spiral galaxy

All the stars that we can see are much larger than Earth. Why do they appear as tiny points of light?

• They are moving very fast.

• The atmosphere blocks most of their light.

• They are trillions of miles away from Earth.

• Their light is absorbed by other galaxies.

What is the difference between a barred spiral galaxy and a normal spiral galaxy?

• the number of spiral arms

• the shape of the center

• the number of stars in the galaxy

• the color of the stars in the galaxy

What is an orbit?

• the turning of a planet on its axis

• the distance of a planet from the sun

• the speed at which a planet moves around the sun

• the path one object takes around another object

What does a solar system contain?

• a group of stars

• a star and the planets near it

• the planets, moons, and asteroids around a star

• a star and all the bodies that revolve around it