A blazing-coloured nebula, a perfect spiral galaxy, a glittering star cluster… AI now produces breathtaking images of the cosmos. The catch: they look uncannily like real photos from Hubble or the James Webb telescope. So — could you still tell the difference?
Yes: real space follows physical laws and instrument signatures that AI imitates poorly. Here's where to look.
Why space is a special case
Faced with a cosmic image, our brain has no everyday reference: everything looks plausible. AI takes advantage of that. But a real photo isn't "pretty at random" — it carries the marks of the telescope's optics and the physics of the objects.
5 tells that give away an AI space image
1. The diffraction spikes on stars
In real telescope images, bright stars show regular "spikes": 4 points for Hubble, 6 points for James Webb (because of its mirror shape). AI forgets them, places them randomly, or gives an inconsistent number.
2. Stars that aren't points
A real distant star is a sharp point. AI often produces blurry, "blobby" stars of inconsistent sizes, or a spray of stars that's too regular, like a pattern.
3. Physically impossible structures
A spiral's arms and a nebula's gas filaments follow a logic. Beware of overly perfect symmetry, "decorative" swirls, or a composition too neatly centred to be real.
4. A background too clean… or too busy
Real deep-field photos teem with tiny background galaxies and a characteristic noise. AI often renders a background that's either abnormally smooth or filled with fake detail that falls apart on zoom.
5. Colours that are too "pop"
Hubble's colours are often "false colour" (each filter encodes a wavelength), but they stay coherent. AI tends toward oversaturated rainbow gradients, closer to a wallpaper than to scientific data.
Train your eye: Space mode
The best way to learn is to play. In our Space mode, a cosmic image appears each round: real telescope photo or AI image? The real ones come from major observatories; the fakes are generated for the occasion.
Real galaxy or AI mirage? How many can you spot?
Play Space mode →In short
AI beautifully imitates the mood of the cosmos, but trips on physics and optics: diffraction spikes, star sharpness, coherent structures, realistic backgrounds. Trust those signatures — and practise; it's the best way to stop being dazzled.