For the case where Omega is exactly equal to one, the Universe is delicately balanced between the two states, and is said to be flat.
For the case where Omega is exactly equal to one, the Universe is delicately balanced between the two states, and is said to be flat.
对于欧米加正好等于平均数的情形，宇宙微妙地在二种情形之间平衡,就被说成是“扁平”。