９ The size of the Universe 【What is the Universe？】Dialogue with the Universe
・The size of the universe is more than 93 billion light-years(ly).  ・・・0.92×１０ˆ１１
・Surface that the universe is expanding at the speed of light
・Distance to the Andromeda Galaxy(the nearest galaxy) is about 2.5 million ly ・・・2.5×１０ˆ６
・By the way, the disk of the Milky Way galaxy is about 100 000 ly in diameter. ・・・１×１０ˆ５
・Distance to the nearest star ・・・４×１０ˆ０
・Solar system is about 100,000 ly in diameter. ・・・0.6×１０ˆ－３
・Distance to the Sun from the Earth ・・・1.6×１０ˆ－５
・Diameter of the sun ・・・1.5×１０ˆ－７
・The Earth is about 13,000 km in diameter. ・・・1.4×１０ˆ－１２
・Human height is about 1.7m. ・・・1.8×１０ˆ－１６
(The length of the DNA in the cell of the human is 1.8 m.)
・The size of human cells is about 15μm. ・・・1.6×１０ˆ－２１
・The size of the atom ・・・1×１０ˆ－２６
・The sizeof hadron (proton, neutron) ・・・1×１０ˆ－３１
☆The size of the atom and the nucleus is different enough human height and cell. So, the nucleus is not visible even look at the atom. (If atom is to be the size of Earth, nuclei is baseball field size, and electrons is smaller than ball.)
・The length of "String" and "other seven spatial dimensions" contemplated in the superstring theory ・・・1×１０ˆ－５１
☆If the reference unit of the size of the universe is the speed of light, the size of the parallel universe is about １×１０ˆ５１ly.
☆It may be there are the 82nd power piece of 10 universe in the parallel universe.
☆Image of the Universe
1. Wikipedia: 観測可能な宇宙(The universe/Japanese)
2. The galaxies, 18 billion light-years more distant from the observer, go far off beyond the speed of light. So we can not observe them.