On the other side of the universe is the reflection here, where there are the same forests, the same rivers, the same houses by the river and the same children.

Although the size of the whole universe is unknown, the size of Hubble's volume can be measured, and its diameter is estimated to be 93 billion light years. Among all kinds of multiverses, a universe is one of the components of a larger multiverse, and each universe itself includes all its space, time and matter.

With the gradual improvement of sky survey technology, human beings are constantly trying to draw the whole picture of the universe. 202 1 1 14, the Beijing-Arizona survey team of the National Astronomical Observatory and the dark energy spectrum survey team jointly released the latest two-dimensional map of the giant universe.