Imagine that our Sun were magically and suddenly replaced by a black hole of the same mass (1 solar mass). What would happen to Earth in its orbit? Earth would almost instantly be sucked into oblivion in the black hole. Earth would orbit faster, but at the same distance. Earth would slowly spiral inward until it settled into an orbit about the size of Mercury's current orbit. Nothing—Earth's orbit would remain the same.
  • The white dwarf will explode completely as a white dwarf supernova.
  • Nothing- Earth's orbit would remain the same
  • a white dwarf in a binary system.
  • It dims and brightens more than twice per second.
Viewed from a distance, how would a flashing red light appear as it fell into a black hole?- it would appear to flash more quickly- it's flashes would appear bluer- it's flashes would shift into the infrared part of the spectrum
  • It's flashes would shift into the infrared spectrum
  • a pulsar that pulses 600 times a second
  • it's spin would slow down
  • A white dwarf in a. Kmart system
If we see a nova, we know that we are observing - a rapidly rotating neutron star- a gamma ray emitting supernova- a white dwarf in a binary system
  • it's spin would slow down
  • a pulsar that pulses 600 times a second
  • A white dwarf in a. Kmart system
  • earth would remain in the same orbit
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