The strongest lines present in spectral class A stars are absorption lines of __________ .
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White dwarfs like Sirius B are typically the size of _______…
White dwarfs like Sirius B are typically the size of __________ .
The vast majority of stars near us in space would fall to th…
The vast majority of stars near us in space would fall to the bottom right on the H-R diagram.
At its brightest, Venus, at magnitude -4, is 100 times brigh…
At its brightest, Venus, at magnitude -4, is 100 times brighter than a 1st magnitude star.
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?