Fill in the blanks in the following statements: 1. A parsec is defined as the distance from the Sun which would result in a parallax of arcsecond as seen from Earth when observed 6 months apart.
2. One parsecs is aboutlight years.
3. The more distant a star, theits parallax.
4. The statement "we can measure stellar parallax for most stars in our galaxy" is.
5. The closest stars have parallaxes smaller thanarcsecond.
6. The first successful measurements of stellar parallax were made byin yearfor the star named.
7. Star Fred has parallax four times greater than star Bob. Star Fred istimesthen star Bob.

Explanation:

1. A parsec is defined as the distance from the Sun which would result in a parallax of_TWO arcsecond as seen from Earth when observed 6 months apart.

2. One parsecs is about_3.3light years

3. The more distant a star, the_LESS its parallax.

4. The statement "we can measure stellar parallax for most stars in our galaxy" is__TRUE .___.

5. The closest stars have parallaxes smaller than_.002 arcsecond.

6. The first successful measurements of stellar parallax were made by_Friedrich Besselin year_1838for the star named.

7. Star Fred has parallax four times greater than star Bob. Star Fred is__4times_nearerthan star Bob.

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