Answer the following question:

Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?

Optical and radio-telescopes are built on the ground because atmosphere can absorb the X-rays but visible and radio-waves are not absorbed by the atmosphere and they can penetrate through it. That’s why Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth.