How does a star form a black hole?
A black hole can be formed by the death of a massive star. When such a star has exhausted the internal thermonuclear fuels in its core at the end of its life, the core becomes unstable and gravitationally collapses inward upon itself, and the star’s outer layers are blown away.
What stage of the life cycle of a star is a black hole?
Black Holes are very strange objects. They are formed when very massive stars come to the end of their lifetime, in a supernova event. Everything that remains of the star is crushed down into an incredibly small, dense object. Close to the object, gravity is so strong that nothing can get away, not even light.
Will our sun go supernova?
The Sun as a red giant will then… go supernova? Actually, no—it doesn’t have enough mass to explode. Instead, it will lose its outer layers and condense into a white dwarf star about the same size as our planet is now. When the Sun leaves behind a nebulae it will no longer be in the Milky Way.
Will Earth lose the moon?
Question(s): The Earth’s moon is moving away from Earth by a few centimeters a year. Calculations of the evolution of the Earth/Moon system tell us that with this rate of separation that in about 15 billion years the Moon will stop moving away from the Earth.
Can Sun become a black hole?
No. Stars like the Sun just aren’t massive enough to become black holes. Instead, in several billion years, the Sun will cast off its outer layers, and its core will form a white dwarf – a dense ball of carbon and oxygen that no longer produces nuclear energy, but that shines because it is very hot.
What did Stephen Hawking say about time travel?
A more fundamental objection to time travel schemes based on rotating cylinders or cosmic strings has been put forward by Stephen Hawking, who proved a theorem showing that according to general relativity it is impossible to build a time machine of a special type (a “time machine with the compactly generated Cauchy …