400×larger and farther away: the Sun
The story behind it
It's a coincidence the Moon covers the Sun almost exactly.
The Sun's diameter is about 400 times the Moon's, but it is also about 400 times farther away. That's why both look almost the same size. But the Moon moves about 3.8 centimetres farther away every year. In 650 million to 1.4 billion years it will no longer cover the Sun completely.
