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## Stellar Parallax

1.
Astronomers have calculated the parallax angles of millions of stars.
1. True
2. False
2.
Nearby stars have large parallax angles.
1. True
2. False
3.
The parallax of a star is inversely related to its
1. temperature.
2. distance.
3. luminosity.
4. diameter.
5. composition.
4.
The parallaxes of nearby stars are produced by
1. stellar motion across our line of sight.
2. stellar motion along our line of sight.
3. the rotation of the galaxy.
4. Earth's rotation on its axis.
5. Earth's revolution around the Sun.
5.
Parallax is useful for measuring the distance of stars up to about                 light-year(s) from Earth.
1. 1
2. 10
3. 100
4. 1,000
6.
1 parsec is about equal to                 light-year(s).
1. 0.326
2. 3.26
3. 32.6
4. 360
7.
Alpha Centauri has a parallax of 0.74 arcsec. What is the approximate distance to Alpha Centauri in parsecs?
1. 0.55 parsec
2. 0.74 parsec
3. 1.35 parsec
4. 1.74 parsec
8.
If a star has a parallax of                      arcseconds, then its distance is                     .
1. 0.2; 20 parsecs
2. 0.04; 25 light years
3. 0.1; 10 light years
4. 0.25; 4 parsecs
5. 0.5; 0.5 parsecs
9.
How does distance affect parallax?

10.
A star has a parallax of 0.5 arc sec. Calculate the distance to the star in parsecs.

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