Type of Galaxies
These galaxies are known for having a flat disk and spiral arms.
Spiral Galaxies
What type of galaxy is the Milky Way
Barred Spiral Galaxy
This force keeps both galaxies and star clusters held together.
gravity
What is your partner's constellation
idk man
1 x 102
100
This percentage of nearby galaxies are spiral galaxies.
What is at the center of the Milky Way
A large black hole called Sagittarius A
True or False: Star clusters are larger than galaxies.
False
Astronomers officially recognize this many constellations
88
The age of the Earth is roughly 4,560,000,000 years. Write this in scientific notation.
4.65 x 109
These objects shoot powerful jets of energy, and appear extremely bright when aimed at Earth.
blazars
Although the Milky Way contains 200–400 billion stars, only about this many new stars form in the galaxy each year.
3–5 new stars
What do scientists use star clusters for?
to learn how stars form, move, and change over time.
This star is also known as the North Star and can be found using the Big Dipper.
Polaris
(4.2 x 10-6)(1.5 x 10-3)
2.5 x 10-5
2.52 x 10-4
This process is believed to form elliptical galaxies.
the collision and merging of spiral galaxies
These two satellite galaxies orbit the Milky Way and are visible from the Southern Hemisphere.
Large and Small Magellanic Clouds
Name two ways a star cluster differs from a galaxy.
a star cluster is much smaller and lacks the size and structure of a galaxy
These constellations never completely disappear below the horizon and can be seen all year in Canada.
circumpolar constellations
The Barnard 68 dark nebula has a radius of 0.25 light years, where 1 light year = 9.3 x 1015 meters. Suppose that the density of the dust grains is about 0.001 dust grain per cubic meter. What is the total mass of dust in this nebula?
5.79 x 1030