OBSERVATION

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Observation — how we actually see the universe.

Almost everything humanity knows about the cosmos arrived as a photon. A telescope is a machine for catching those photons more carefully than your eye can — across more of the spectrum, for longer, with the noise stripped out. Optical telescopes for visible light, X-ray observatories for the violent stuff, infrared for the cold and the distant, radio for the things that don't glow at all. Each instrument is a window onto a different physics.

This tab is two halves. The first five sections cover the methods — how photographs are taken in space, how adaptive optics defeats the atmosphere, how coronagraphs hide a star to find its planets, how a spectrum tells you what a star is made of, how interferometry stitches separate telescopes into one virtual aperture larger than any of them.

The last two cover the strangest objects those methods have found. Black holes are real, mapped, and weighed; we have shadow-images of two of them. Wormholes are pure mathematics — included here so you know exactly what to do with them when you see one in a film (admire the geometry; expect no spacecraft).

Pick a section that calls to you. The space-photography one is the easiest entry point — it's where every image you've seen of a galaxy or nebula or exoplanet host star actually comes from.