If a star has a parallax of 0.02 seconds of arc, then its distance is
a. 20 pc.
b. 50 pc.
c. 2 pc.
d. 5 pc.
e. 500 pc.
b
You might also like to view...
Which statement accurately describes how observations of distant galaxies help us learn about galaxy evolution?
A) By observing galaxies with different lookback times, we learn how galaxies appeared at different stages of their evolution. B) We can observe the birth of galaxies. C) We can observe the evolution of a single galaxy over time. D) We can watch as two galaxies merge and view the result, helping us learn how mergers affect evolution. E) We can see what our galaxy used to look like and therefore theorize about the physical processes that led to its current appearance.
Why is it difficult to directly measure the size of a star's disk from Earth?
What will be an ideal response?
A goldfish bowl is spherical, 8.0 cm in radius. A goldfish is swimming 3.0 cm from the wall of the bowl. Where does the fish appear to be to an observer outside?
The index of refraction of water is 1.33. Neglect the effect of the glass wall of the bowl. A) 3.3 cm inside the bowl B) 3.9 cm inside the bowl C) 2.5 cm inside the bowl D) 3.0 cm inside the bowl E) 1.7 cm inside the bowl
A flask of water rests on a scale. If you dip your finger into the water, without touching the flask, the reading on the scale will
A) decrease. B) stay the same. C) increase. D) behave unpredictably.