Stellar neighborhood review

Kepler's 1st law tells us planetary orbits take what shape?

• Circles

• Egg-shaped

• Ellipses

• Parabolas

• Hexagons

Kepler's 2nd law tells us what about the orbits of planets?

• They go the same speed at every point in their orbits

• They sweep out the same area of their orbits

• They stay the same distance from the Sun at each point in their orbit

Kepler's 3rd law tells us that as an object moves farther from the Sun, its period:

• gets larger

• gets smaller

• stays the same

As a planet moves farther out in its orbit, what grows faster, its distance or period?

• distance

• Period

• They grow at the same rate

• If one grows the other shrinks

Two mystery stars are observed. Star A has a parallax angle of 0.0025 arcseconds. Star B has a parallax angle of 0.0037 arc seconds. Which star is closer?

• Star A

• Star B

• They're equally far

• More information is needed

Someone measures something about a star and tells you the value is one parsec. What does that tell you about the star?

• It has a parallax angle of 1 arcsecond

• It takes 1 year to travel to it at the speed of light

• It rotates once every 1000 seconds

• It has the same luminosity as the Sun

What is an astronomical unit (choose all that apply)

• The distance from the Earth to the Sun

• The distance that's used to measure a parallax angle

• A common unit used to measure planetary distances

• A unit for measuring long periods of time in the universe

Which of these types of light have more energy than visual light? (choose all that apply)

• infrared

• ultraviolet

• radio

• x-rays

• gamma

What does the frequency of a wave tell us?

• The distance between two wave peaks

• How fast the wave is traveling

• The height of the wave

• How many cycles of the wave go by every second

What is proxima centauri

• The closest star to the Earth

• The largest star in the alpha centauri system

• The brightest star in our solar neighborhood

• The most sun-like object in our solar neighborhood