Meteors are bits of asteroids that are floating aimlessly around in space.

Meteoroids usually come from comets or asteroids.

The sun is considered a super-giant star.

A star's apparent brightness is its brightness as seen from Earth.

Scientists believe that the moon has been hit by numerous meteoroids because they can see that it has many

In a geocentric system,

A streak of light made by a chunk of rock or dust entering Earth's atmosphere is called a(n)

The four terrestrial planets all have

The __________ is located between the orbits of Mars and Jupiter.

A(n) ____________ is a loose collection of ice, dust, and small rocky particles that typically have a long, narrow orbit.

Short term comets typically originate from where?

Long term comets typically originate from where?

What characteristic does a star's color typically indicate?

Which characteristic does NOT describe the outer planets?

Which element is the most abundant in the universe?

Mark all of the characteristics that apply to the inner planets

Most comets have ______ tails. One is made of ______ and the other is made of _______.

The inner core of a comet is called the ____________.

Which of the choices below describes why scientists study comets, asteroids, and meteors?