Stars, Gas, Dust
What are stars the primary source of?
Light
What year was he born?
1473
Define galaxy...
Collection of gas, dust, and stars.
In 1773, what was Messier searching for?
Comets
What century was Hubble in?
Early 20th
Why do stars shine?
Nuclear reactions.
Define Heliocentric
sun at the center
List the 3 main types of galaxies we talked about.
Spiral, Elliptical, and Irregular
What is a nebula?
A cloud-like object
How many inches was the Hooker Telescope?
100
What does interstellar gas consist of?
Hydrogen and helium.
What did he use to show how the motions of the planets could be described if Earth was also moving? (Hint: it's a subject in school)
Math
Provide one example of a spiral galaxy.
Milky Way, Andromeda
What is M31 known as?
Andromeda Galaxy.
What was the name and state the telescope was in?
Mt. Wilson Observatory in California
What is Cosmic dust made up of?
Small solid particles like silicates and carbon.
What year was his book published? (Bonus points: what else happened that year)
1543
Bonus: He died
What type of galaxy is the largest and most common?
Elliptical
What did this discovery mark the first identification of?
A galaxy beyond our own Milky Way.
What are individual stars called that he found?
Cepheid
What is Dark matter?
An invisible substance?
What were the astronomers' names who made his theory gain acceptance?
Johannes Kepler and Galileo Galilei
What type of galaxy is usually smaller and dimmer than other types?
Irregular
What did he describe Andromeda as?
Nebula without star, very obscure and pretty large.
Were these nebulae closer or farther away than we used to think?
Farther away