Tars
06-05-2010, 06:28 PM
From Astronomy Magazine (https://www.astronomy.com/asy/default.aspx) 01/19/10:
What Is The Universe Expanding Into?
https://rriddle.com/Pix/expanding_universe_220.jpg"This is another question that comes from stretching the balloon analogy of the expanding universe too far. The universe is self-contained. As difficult as it is to believe, the universe can expand without expanding into something else.
Einstein's relativity provided a new way of looking at the universe. It pictures gravity not as a force, but as curves in space-time. Matter and energy in a gravitational field move the way curved space-time dictates. Relativity's space-warping behavior predicts that gravity bends light.
In 1919, a total solar eclipse gave scientists direct evidence. If massive objects warp space, light from a distant star would be displaced if the star's light passed close to a large mass, like the sun. The effect is small, but sure enough, astronomers observed changes in position of the stars near the Sun during the eclipse. This is but one of many validations of Einstein's theory. Relativity gives modern cosmology a solid foundation. As de Sitter showed, space is a dynamic entity that can warp, shrink, and grow without the necessity of being embedded in some higher dimensional space."
What Is The Universe Expanding Into?
https://rriddle.com/Pix/expanding_universe_220.jpg"This is another question that comes from stretching the balloon analogy of the expanding universe too far. The universe is self-contained. As difficult as it is to believe, the universe can expand without expanding into something else.
Einstein's relativity provided a new way of looking at the universe. It pictures gravity not as a force, but as curves in space-time. Matter and energy in a gravitational field move the way curved space-time dictates. Relativity's space-warping behavior predicts that gravity bends light.
In 1919, a total solar eclipse gave scientists direct evidence. If massive objects warp space, light from a distant star would be displaced if the star's light passed close to a large mass, like the sun. The effect is small, but sure enough, astronomers observed changes in position of the stars near the Sun during the eclipse. This is but one of many validations of Einstein's theory. Relativity gives modern cosmology a solid foundation. As de Sitter showed, space is a dynamic entity that can warp, shrink, and grow without the necessity of being embedded in some higher dimensional space."