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.

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