- An optical telescope requires visible light for human to use
- Clouds / dusts block visible light
- So, if there is clouds or dusts, then the optical telescope cannot be used

- If there is clouds or dusts, then the optical telescope cannot be used
- Radio telescopes can see through clouds and dust
- Therefore, the radio telescopes can still be used when there is clouds or dusts

Therefore, the radio telescopes can still be used when there is clouds or dusts
Q: What advantage is gained by using radio telescopes as opposed to optical telescopes?
Context:
- An optical telescope requires visible light for human to use 
- Radio telescopes can see through clouds and dust 
- Clouds / dusts block visible light