Flashcards: Universe

Front

In 1924, which astronomer made an incredible discovery using telescopes?

Back

Edwin Hubble

Front

Estimate the number of galaxies in the known universe.

Back

200 billion

Front

What percentage of known galaxies are spiral galaxies?

Back

77%

Front

Spiral galaxies have bulge, disc, and ______ components.

Back

halo

Front

How old is the Milky Way galaxy estimated to be?

Back

12 billion years

Front

The Milky Way is shaped like a huge disc with spiral arms and a central core. We are located about ______ light-years from the galaxy's center.

Back

25,000

Front

Characteristic of elliptical galaxies?

Back

They contain mostly older stars

Front

Irregular galaxies make up ___% of known galaxies?

Back

25%

Front

What do stars begin as? Options: Massive clouds of dust and gas called nebulae, Small rocks and pebbles, Solid metal cores, Liquid water bodies

Back

Massive clouds of dust and gas called nebulae

Front

Gravity pulls the dust and gas together to form a ______.

Back

Protostar