Learning path

Observatories & Telescopes

How astronomers observe the universe — across every band of light and beyond, from mountaintop optical giants to space telescopes, radio arrays, and gravitational-wave detectors. Built on real observatories, telescopes, and surveys.

Beginner

1.1Why telescopes matterHow instruments extend human vision into the cosmos.
1.2Light and the electromagnetic spectrumThe bands of light astronomers observe.
1.3Optical telescopesGathering visible light with mirrors.
1.4Radio astronomyListening to the radio universe.

Intermediate

2.1Space telescopesObserving from above the atmosphere.
2.2Infrared astronomySeeing heat and the hidden universe.
2.3X-ray and gamma-ray astronomyThe high-energy cosmos.
2.4Survey astronomyMapping the whole sky.

Advanced

3.1InterferometryCombining telescopes for sharper vision.
3.2Detectors and instrumentsThe cameras and spectrographs behind the science.
3.3Gravitational-wave astronomySensing ripples in spacetime.
3.4Multi-messenger astronomyCombining light, waves, and particles.

Continue learning

Human Spaceflight →History of Space Exploration →

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