How are we able to know how extremely far galaxies look like? Shouldn’t they be completely covered/invisible because of the huge amount of celestial bodies that are closer to us?

Question

After a certain distance, won’t all the celebrities bodies create some sort of wall where we can’t see further?

In: 0

Answer 1

Some spectrums of electromagnetic radiation, like infrared, x-rays, heat residue etc can normally pass through obscuring objects, and thus allowing us to observe what’s behind them.

Also, space isn’t that dense. Distances between things in space are extreme, so outside of some specific giant gas clouds we pretty much never reach a point in our observable universe where things are so packed together as to obscure another thing completely, and even if they are the effect of gravitational lensing still allows us to at least partially see what’s happening behind them.