At its brightest, Venus, at magnitude -4, is 100 times brighter than a 1st magnitude star.
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If Vega is apparent magnitude zero, and Deneb first magnitud…
If Vega is apparent magnitude zero, and Deneb first magnitude, then:
A star’s absolute magnitude is its apparent brightness as se…
A star’s absolute magnitude is its apparent brightness as seen from:
Main sequence stars are fusing hydrogen into helium in their…
Main sequence stars are fusing hydrogen into helium in their cores.
A star’s color index is a quick way of determining its
A star’s color index is a quick way of determining its
The absolute magnitude scale is defined so that a difference…
The absolute magnitude scale is defined so that a difference of five magnitudes is a luminosity difference of ___________.
A star is 10 parsecs from Earth. Which statement is true?
A star is 10 parsecs from Earth. Which statement is true?
The stars with masses comparable to our Sun’s, but sizes lik…
The stars with masses comparable to our Sun’s, but sizes like the earth are:
Rigel has an apparent magnitude of +0.18 and Betelgeuse an a…
Rigel has an apparent magnitude of +0.18 and Betelgeuse an apparent magnitude of +0.45. What can you conclude from this?
Only type O stars are hot enough to show ionized __________…
Only type O stars are hot enough to show ionized __________ in their spectra.