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Oct
13
comment Is it possible that a ultra-large portion of the space we live in is already inside a black hole? How could we refute this?
Here is the correct link to the discussion: chat.stackexchange.com/rooms/17780/…
Oct
13
comment What one can see inside a black hole?
@TildalWave The more massive a black holes is the lower gravitational gradient at the event horizon it has. I think that we can assume that it is possible to cross the event horizon of a supermassive black holes without destruction. See for example Inside or outside the event horizon.
Oct
9
comment What is the ratio of cosmic microwave background radiation to normal radiation?
@Jonathan: The "area" you are describing is called the surface of last scattering. See cosmic microwave background on Wikipedia.
Oct
9
awarded  Yearling
Oct
8
revised Why aren't there galaxy-sized balls of iron out there?
formatting, more explanation
Oct
8
comment Why aren't there galaxy-sized balls of iron out there?
@HDE226868 thanks for the note. I thought that it was obvious (also from the first paragraph) that the collapse happens when the fusion activity decreases. I have edited the answer to explicitly mention the end of the fusion. --- The second paragraph is only to mention the star mass limit for the Fe nuclei not to be destroyed by the star collapse.
Oct
8
revised Why aren't there galaxy-sized balls of iron out there?
explicitly mention that the collapse happens when the fusion decreases
Oct
8
reviewed Satisfactory Why aren't there galaxy-sized balls of iron out there?
Oct
8
answered Why aren't there galaxy-sized balls of iron out there?
Oct
7
reviewed Satisfactory How many light years away is Earth from the closest outer edge of the black hole at the center of the Milky Way?
Oct
7
reviewed Satisfactory Original Hubble diagram units incorrect?
Oct
7
reviewed Needs Improvement Data for red-shifting
Oct
7
reviewed Satisfactory Which spiral arm of the Milky Way is Kepler-62 in?
Oct
7
reviewed Needs Improvement Weight of a celestial body
Oct
7
reviewed Needs Improvement What is CMB radiation doing to the universe?
Oct
7
reviewed Satisfactory Is there a paper on galaxy mergers in clusters of galaxies?
Oct
7
reviewed Satisfactory Name of area close to Local Bubble?
Oct
7
awarded  Custodian
Oct
7
reviewed Needs Improvement Time after sunset until star can be seen
Oct
7
revised Can we (theoretically) spin the black hole so strong that it will be broken apart by centrifugal force?
formatting