Why Can't I See Galaxies? The Truth About Light Pollution

Here is the thing nobody tells you when you buy your first telescope. Those swirling purple and pink galaxy photos online were taken from a mountain top in Chile by a camera that exposed for nine hours. Your eyes have a slightly different setup.

What you are dealing with from a UK back garden is mostly a contrast problem. The galaxies are still up there, exactly where they have always been. The issue is that there is so much background glow from streetlights, neighbours' security floods and that one shop sign two roads over that the faint light from a galaxy gets drowned out before it ever reaches your eye.

Signal versus noise (the only physics you need)

Imagine trying to hear someone whispering across the room while a hairdryer is running. Their voice (the signal) has not got any quieter. The hairdryer (the noise) is just so loud it covers the whisper completely.

Light pollution is the hairdryer. The Andromeda Galaxy is the whisper. From a city centre you might not be able to spot it at all, even though it is the largest object in our night sky and contains a trillion stars. From a properly dark site three hours' drive away, you can see it with your bare eyes as a faint, fuzzy patch the size of a thumbnail held at arm's length.

What you actually see versus what Hubble sees

This bit is important and a bit deflating. Through a beginner telescope from a UK suburb, here is what real galaxies look like:

• A faint grey smudge. That is it. No colour, no swirly arms, no sparkle.
• Sometimes you can see a brighter core and a slightly fuzzier outer halo. That is genuinely amazing if you stop and think about it.
• The reason there is no colour is that the light is so faint that your colour-sensitive cones in your retina cannot fire. You are seeing in monochrome, the way you do at night.

Once you accept this, the hobby becomes much more rewarding. You stop chasing impossible images and start enjoying photons that left their source two and a half million years ago and ended their journey on the back of your eyeball. That is a properly mad thing to be a part of.

What to do about it

You have three honest options.

1. Drive to darker skies

Even half an hour out of town makes a noticeable difference. An hour gets you somewhere you can see the Milky Way. Two hours into Wales, the Lake District, Northumberland or anywhere with a Dark Sky Reserve and the sky genuinely transforms. Andromeda becomes visible to your bare eyes. The Orion Nebula starts showing structure.

2. Use binoculars instead of a telescope

This sounds counter-intuitive but binoculars give you a much wider field of view, which means more sky in one frame and a better chance of spotting faint fuzzies by sweeping. They are also lighter, faster to set up, and you can chuck them in the boot of the car for any clear-ish night.

3. Lower your sights, literally

The Moon, planets and bright clusters are all properly bright objects. They cut through light pollution like a torch through fog. Saturn's rings, Jupiter's moons, the craters of our own Moon, the Pleiades cluster, the Orion Nebula in winter. These will all give you that "wow, I can really see it" feeling that the faint galaxies cannot from a city.

Where binoculars come in

If you have not bought a telescope yet, hold off. A decent pair of 10x50 binoculars will show you more sky than a cheap telescope, gives you wide-field views of the Milky Way, the Pleiades, the Andromeda Galaxy and dozens of clusters that look better in binoculars than they do in any scope. They cost less than a takeaway delivery and they survive being thrown in a rucksack. Most experienced stargazers still own a pair and reach for them on more nights than the telescope.