01
No hard edges
Wavelength changes smoothly — "infrared" fades into "visible" fades into "ultraviolet" with no sharp line, these are just useful labels.
Astronomy · Question
Is visible light all there is to see in space?
Your eyes detect only a tiny sliver of the electromagnetic spectrum. Astronomers study radio, infrared, X-ray, and other light invisible to us. Select a band or explore the logarithmic wavelength scale to see what changes — and why.
Visual model
Drag across the spectrum.
Choose a band or move through wavelengths. This ruler is logarithmic: equal distances represent equal factors of ten, not equal wavelength differences.
Wavelength
Frequency
Photon energy
Wave relationship · conceptual preview
Illustrative wave only — cycle count is not to scale. Numeric values above use the physical wavelength, with frequency = c / λ and photon energy = h × frequency.
Visible light
The narrow band your eyes detect — the only part of this whole spectrum humans can see without an instrument.
Approximate wavelength ranges
NASA's reference ranges are approximate; band boundaries are conventions, not physical walls. Radio extends beyond the left edge and gamma rays beyond the right.
| Band | Approximate wavelength |
|---|---|
| Radio | Longer than 0.1 m |
| Microwave | 1 mm – 0.1 m |
| Infrared | 700 nm – 1 mm |
| Visible | 400 – 700 nm |
| Ultraviolet | 10 – 400 nm |
| X-ray | 0.01 – 10 nm |
| Gamma ray | Shorter than 0.01 nm |
What's simplified
The spectrum is continuous, not seven boxes.
02
Most bands need space telescopes
Earth's atmosphere blocks most X-rays, gamma rays, and much infrared — a major reason telescopes like Hubble, Chandra, and JWST are in space.
Misconception check
Quick check.
Quick check
Go deeper
Keep exploring.
Next in this series →
Light-year ↗
Measuring cosmic distance by lookback time.
Learn
Why are NASA images false color?
The direct consequence of most astronomy happening outside visible light.
Black holes
What is a black hole?
Something we can only "see" through indirect wavelengths.