But actually nothing is forever. As a matter of fact we know that the solar system---that is the Sun and the planets (mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune) plus the minor planets like Pluto, and the asteroid and the comets, all formed at the same time long ago.

How long?

Well, the answer is 4,567,000,000 years ago... that is 4.57 billion years ago!!!!

The average human being generally lives for about 80 years! So the solar system is much, much older.

However it will not be here forever.

We know that in about 5,000,000,000 years from now, the Sun will run out of fuel and it will expand to become a red giant star. When it does that, it will swallow up the inner planets and the rocks of the earth will evaporate.

Of course that is a long, long time from now.

So, there is nothing to worry about.