Astro 1500 Trivia - Dec. 4, 2024 - Lectures 22-25

What is stellar parallax?

• A tool used to measure radial velocity in stars

• A tool used to measure tangential velocity in stars

• A tool used to measure distances of stars

• A tool used to analyze a stars elemental composition

How does the Gaia satellite aid with Stellar Parallax?

• Gaia can measure distances much further away than 200 pc using stellar parallax

• Gaia measures stellar parallax while accounting for proper motion

• Gaia can travel on either side of the sun to measure stellar parallax much quicker

• Gaia measures stellar parallax while accounting for effects of gravity

For a main-sequence star, what information do we need to know to find the stars distance?

• Radial Velocity and Apparent Brightness

• Apparent Brightness and Tangential Velocity

• Tangential Velocity and Spectral Type

• Apparent Brightness and Spectral Type

How can we measure distances using cepheid variable stars?

• Measuring the period to get luminosity, then use brightness to get distance

• Since the luminosity for these stars are constant, we measure brightness to get distance

• Measuring the doppler shift of the star to get distance

• Finding the stars spectral type to get luminosity then use brightness to get distance

A spiral galaxies rotational speed is proportional to its:

• mass

• distance

• brightness

• color

Tags

NGSS.HS-PS2-4

Which of the following can determine the distance to a galaxy?

• Stellar Parallax

• Some Variable Stars

• Type 1A Supernovae

• Hubble's Law

Hubble's Law relies on the fact that:

• Galaxies in Local Groups are moving towards each other

• The universe is expanding at a uniform rate

• Gravity pulls galaxies at a constant rate

• The doppler effect is not changed by an expanding universe

Tags

NGSS.HS-ESS1-2

Which of the following is the correct order based on size (smallest to largest)?

• Local Group, Galaxy Supercluster, Galaxy Cluster, Universe

• Local Group, Galaxy Cluster, Galaxy Supercluster, Universe

• Galaxy Cluster, Galaxy Supercluster, Local Group, Universe

• Galaxy Cluster, Galaxy Supercluster, Universe, Local Group

Which of the following are gravitationally bound?

• Galaxies in Local Groups

• Galaxies in clusters

• Galaxies in Superclusters

• All galaxies are gravitationally bound because they are so massive

Tags

NGSS.HS-PS2-4

Which of the following is evidence for Dark Matter II (Dark Matter in galaxy clusters)

• Hot Gas between the galaxies in clusters

• Gravitational Lensing

• Galaxies Velocities

• The amount of galaxies in clusters