DE_Phys_6.2.2_SDAIE

What did the invention of telescopes allow scientists to observe about the Milky Way?

• It is smaller than previously thought

• It is made up of stars

What did Edwin Hubble discover in 1924 using a 100-inch telescope?

• Telescopes can see black holes

• Many fuzzy objects in the sky are distant galaxies

How do scientists classify galaxies?

• By their color

• By their shapes

What shape is the Milky Way galaxy?

• Rectangular

• Spiral

What type of galaxy is shaped like a sphere that has been stretched?

• Irregular

• Elliptical

How many stars does the Milky Way Galaxy approximately contain?

• Over 100 billion stars

• Nearly 1 billion stars

What is the approximate diameter of the Milky Way Galaxy?

• 100,000 light-years

• 1,000 light-years

What is the term for a group of stars, dust, and gases held together by gravity?

• Asteroid

• Galaxy

Which galaxy is known as our Milky Way's nearest galactic neighbor?

• Andromeda Galaxy

• Triangulum Galaxy

• Large Magellanic Cloud

• Whirlpool Galaxy

What is the term for the path an object takes as it moves around another object in space?

• Rotation

• Revolution

• Orbit

• Gravity