what is space ? what is black hole ? what is vaccum ?
Answers
Answer:
Space - It is the boundless three - dimensional extent in which objects and events have relative position and direction.
Black Hole - It is a place in space where gravity pulls so much that even light can not get out.
Vaccum - It is a situation from which something is missing or lacking.
Answer:
Space is an almost perfect vacuum, nearly void of matter and with extremely low pressure. In space, sound doesn't carry because there aren't molecules close enough together to transmit sound between them.
A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. Because no light can get out, people can't see black holes.
vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).