Exam 4

How is a lenticular (s0) galaxy like a spiral galaxy?

An s0 contains many high-mass main sequence stars

An s0 has a disk

An s0 has large amounts of gas and dust

An s0 has spiral structure

None of the above; an s0 has no properties like a spiral

Which is NOT corret

The local group consists of the nearest approximately 40 galaxies to our own

The milky way and m31 are the two largest galaxies in the local group

The milky way and m31 are both spiral galaxies

The milky way and m31 are moving away from each other

The galaxies in the local group are clustered around the milky way and m31

Which of the following is NOT expected to occur when spiral galaxies collide at low spped

Collisions between gas clouds

Formation of streamers of stars, resembling atennae or tails

Formation of new stars

Formation of ellipitical galaxies

Direct physical collisions between stars

When we add the total mass contained in both galaxies and hot gas in clusters of galaxies we find that:

This only accounts for less than about 15% of the mass of the cluster

The accounts for about 90% of the mass of the cluster

This exactly accounts for the mass of the cluster

This is more than the total mass of the cluster

None of the above; clusters of galaxies do not contain hot gas

According to the hubble law, for all but the nearest galaxies, the recession velocity of a galaxy is (blank) the distance of the galaxy

Which type of planet is most easily detected by the velocity wobble method

Low mass planet, close to parent star

Low mass planet, far from parent star

High mass planet, close to parent star

High mass planet, far from parent star

None of the above; since the mass o the planet and its distance from the parent star do not affect its detectability

Which of the following is NOT correct regarding habitable planets

If a stars mass is too low, the stars lifetime is too short for life to develop on an orbiting planet

If the atmosphere of a planet is too thick, there can be a runaway greenhouse effect as on Venus

If the atmosphere of a planet is too thin, it cannot maintain liquid water on its surface

A habitable planet must have a solid surface

The Kepler mission detects planets orbiting stars other than the Sun by measuring the dip in the brightness of the star when the planet blocks a small portion of the light of the star. This is known as _____.

A standard candle has a known (blank). By measuring its apparent brightness, we can determine its (blank)

The stars in elliptical galaxies

Are all old

Are both young and old

Are all young

In comparison to the other galaxies in the local group, the milky way and the andromeda galaxy are

Smaller than average size

About average size

Larger than average size

Most of the mass of a galaxy cluster is in the form of

Galaxies

Gas

Dark matter

When hubble measured doppler shifts for galaxies, he found that

Most galaxies have red shifts

Most galaxies have blue shifts

Galaxies have red shifts and blue shifts in about equal numbers

None of the above; hubble was not able to measure doppler shifts for galaxies

According to the hubble law, the recession velocity of a galaxy at 1000 Mpc (blank) that of a galaxy at 100 Mpc

Smaller than

About equal to

Larger than

What does the miller-urey experiment show

It is possible to create life within a test tube from inorganic materials

It is possible to break down organic compuonds in a test tube into inorganic compounds

It is possible to create amino acids within a test tube from inorganic compounds

It is possible to recreate extinct life forms from DNA found in fossils

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