Astro 150 Trivia - 11/3/2023

Which portion of the Milky Way houses the oldest stars?

• Thin Disk

• Thick Disk

• Stellar Halo

• Galactic Outskirts

How much of our Galaxy's mass is made of dark matter?

• 20%

• 45%

• 70%

• 95%

How do we know that 95% of the mass of the Milky Way is in the form of Dark Matter?

• 
  We detect dark matter directly

• 
  Stars appear to be orbiting at speeds higher than expected

• Due to the speed which Andromeda is approaching the Milky Way

• 
  The escape velocity for satellites leaving the Milky Way is higher than expected

Which of these is the rotation curve we really see?

• The left one--the extra mass from dark matter leads to the rotation being slowed down

• The right one--the extra mass from dark matter leads to the rotation being sped up

• The left one--the stars orbit the Milky Way center the same way planets do

• The right one--the stars orbit the Milky Way center the same way planets do

Drag and drop the galaxies into their corresponding types.

Groups:

(a) Spiral

,

(b) Elliptical

,

(c) Irregular

,

(d) Barred Spiral

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What kind of galaxy is the Milky Way?

• An elliptical galaxy

• A spiral galaxy

• We don't know

• A barred spiral galaxy

What are the Small and Large Magellanic Clouds?

• Open Clusters

• Globular Clusters

• Dwarf Galaxies

• Spiral Galaxies

Galaxies form when ​​

• Gas clouds collapse to form a disk

• Stars form close to each other and gravitate toward one another

• A supermassive black hole starts picking up stars to orbit it

• A bunch of matter clumped together during the Big Bang

Match the different characteristics for globular clusters and satellite galaxies

Groups:

(a) Satellite galaxies

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(b) Globular clusters

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(c) Both

• Contain only population II stars

• Have no spiral arms

• Orbit galaxies

• Forming lots of stars

• Contain population I and II stars

Where are spiral galaxies usually found?

• Anywhere

• All alone

• In sparse groups

• In dense clusters