Today, I went to the Natural History Museum and saw many things there. I would like to share some of my knowledge with you. Among the 8 planets, it is easy to notice an immense change in size from Mars to Jupiter. This is because Jupiter, Saturn, Uranus and Neptune are made of gas and not rock, like the first four planets. If you compare the same mass of gas and rock, gas will have far more volume than rock, which results in such differences in the size of the planets, from Mars to Jupiter.

15 billion years ago, the universe was created via the Big Bang, and 4.6 billion years ago, the Earth was formed. The Earth is made up of four parts: the crust, the mantle, the outer core and the inner core. The mantle and the core take up most of the Earth¡¯s volume, but the crust is something we humans can¡¯t live without . The crust is made of solid rock, but the mantle is not. We can only walk on solid ground, not liquidized metal. I hope this simple fact can teach us to not ignore small beings and favor the biggest.

* Hi,

Great job! Your English is really impressive. What does this sentence mean, though: 'I hope this simple fact can teach us to not ignore small beings and favor the biggest?' I just want to make sure I understand what you are saying ^^