If the orbital radius of the Earth were greater than its actual value, the parallax angle to nearby stars would be
Higher
If the orbital radius of the earth were greater than its actual value, the maximum distance a star could be away from earth
Higher than the actual upper limit
Stars that have the highest apparent brightness are
very luminous and nearby .
Massive-star supernovae are not good standard candles because
they have different luminosities
Which two things are needed to determine a standard candle's distance from earth
Apparent brightness and luminosity.
About how long it take for a radar pulse o travel round trip from Earth to Neptune and back again t earth?
8 Hours
A super nova is observed in galaxy 2000 million ligh years away. How long ago did the supernova occur?
2 billion years ago.
Which type of standard candle is the most appropriate for determining the distance to nearby galaxies
Cepheid Variables