How far would a white dwarf star had to be? ?

Assuming this on a completely different planet than Earth.

1) How far would a white dwarf star have to be so it would appear as bright in the sky as bright as the SUN is to Earth?

1B) If the White Dwarf was that distance, how would the gravity be on this planet.

2) How far would a white dwarf star have to be so it would appear as bright in the sky as bright as the MOON is to Earth?

2B) If the White Dwarf was that distance, how would the gravity be on this planet.

4 Answers

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  • Anonymous
    1 month ago

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  • 1 month ago

    (1) Taking Sirius B as an example, it would need to be around five times closer.

    (1B) It makes no practical difference except to tidal forces, which would be somewhat stronger.

    (2) Cynthia varies in brightness a lot.

    (2B) Even less difference.

  • John
    Lv 6
    2 months ago

    A white dwarf star suffers electron degeneracy, avoid at all cost.

  • 2 months ago

    Luminosity of a billion-year-old white dwarf is said to be about 0.001 times that of our sun.  So it would have to be sqrt(1000) = about 32 times closer, i.e. about 3 million miles from here.  Its radius might appear much smaller than that of the sun, but the brightness would be comparable.

    The manner in which it would affect the gravity on this planet is that it would raise large tides (much larger than those caused by our own moon).  Tide-generating force is proportional to M/R^3, so if our own sun raises tides (now) with about half of the effect of the lunar tides, the nearby white dwarf, if of 1 solar mass, would raise thousands of times as much tide and in fact would very possibly tear the earth apart.

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