Why do the terrestrial planet lack hydrogen and helium in their atmospheres?

Thermal escape

Explanation:

Because hydrogen and helium were blown by solar wind

Explanation:

There are four terrestrial planets in Copernican system. They four planets are :

1. Venus.

2. Mercury.

3. Earth. and

4. Mars.

In these four planets, there's no presence of hydrogen and helium in their atmosphere.

The reason for this is that these gases were blown away by the solar wind because of there closeness to the sun.

For this same reason, these planets have high temperature because of absence of hydrogen and helium in their atmosphere.

personally, i think the games do because it's actually them controlling it. this might cause them to think it's okay to do it for real. as for animated movies i think they are mostly fine because they're animated. also, animation has come a long way causing animated movies to become more real but 30 years ago this wouldn't be as big of a problem as today.