Question 1

A large galaxy is essentially&#10;A) a small amount of normal matter uniformly mixed with a large amount of dark matter.&#10;B) a central mass of dark matter surrounded by a small amount of normal matter.&#10;C) a large amount of normal matter surrounded by a diffuse halo of a small amount of dark matter.&#10;D) a small amount of normal matter embedded in a halo of a large amount of dark matter.

Accepted Answer

a small amount of normal matter uniformly mixed with a large amount of dark matter.&#10;

Question 2

Dark matter may be composed of this particle:&#10;A) WIMP&#10;B) MACHO&#10;C) neutrinos&#10;D) neutrons

Accepted Answer

WIMPs (Weakly Interacting Massive Particles) are a leading theoretical candidate for dark matter due to their properties that align with the expected behavior of dark matter, such as being massive and interacting weakly with normal matter.

Question 3

The halo of our galaxy may have these large objects in it to account for dark matter:&#10;A) WIMP&#10;B) MACHO&#10;C) neutrinos&#10;D) neutrons

Accepted Answer

MACHOs (Massive Compact Halo Objects) are large objects that could be in the halo of our galaxy and might account for some of the dark matter. These include objects like black holes, neutron stars, and faint stars that do not emit much light but have significant mass.

Question 4

The approximate amount of dark matter in our galaxies' halo is _____ times more than our visible matter.&#10;A) 2&#10;B) 5&#10;C) 10&#10;D) 20

Accepted Answer

Dark matter is estimated to be about 10 times more abundant than visible matter in our galaxy's halo, explaining the gravitational effects that cannot be accounted for by visible matter alone.

Question 5

Vera Rubin found the rotational velocities as you move away from the core of a galaxy show a&#10;_________________________________.

Accepted Answer

The answer of Vera Rubin found the rotational velocities as...

Question 6

The most direct way to see dark matter is by observing the ____ of spiral galaxies.

Accepted Answer

The answer of The most direct way to see dark...

Question 7

The dark matter halo of our galaxy is about 2 times the visible matter.

Accepted Answer

The dark matter halo of our galaxy is actually much larger, estimated to be about 10 to 30 times the mass of the visible matter.

Question 8

Special relativity is the study of gravity.

Accepted Answer

Special relativity, proposed by Albert Einstein, focuses on the structure of spacetime and the relationship between space and time under the condition of constant velocity. It does not directly address gravity; that's the realm of General Relativity.

Deck 79: Dark Matter