Universe, Galaxies and Astronomers

The brighter the star

• the closer it is and/or older it is

• the closer it is and/or younger it is

• the farther away it is and/or younger it is

• the farther away it is and/or older it is

Which is the smallest structure

• planet

• universe

• galaxy

• solar system

First to see sunspots

• Johannes Kepler

• Tycho Brahe

• Galileo Galilei

• Sunspots have never been seen

What are stars?

• rocky bodies

• hot exploding balls of gas

• satellites

• five pointed shapes

We can't see all the stars in our galaxy because they

• revolve too quickly

• are to hot

• are to far away

Determined that planets obit the sun in ellipse not a circle

• Johannes Kepler

• Galileo Galilei

• Tycho Brahe

Stars are really close together in outer space

• True

• False

Galaxies are held together by

• dust

• stars

• gas

• gravitational attraction

Improved methods of astronomy observation

• Johannes Kepler

• Galileo Galilei

• Tycho Brahe

Why do other stars appear so much smaller than the sun?

• They are much smaller

• They are not as bright

• They are dwarf stars

• They are so far away