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How do astronomers learn about something in space that is very far away? In addition to images, they study the light from cosmic objects like planets, stars, and galaxies. Astronomers spread light out to look at the detailed rainbow spectrum (plural: spectra). Light carries a lot of information, if you learn to “read” its rainbow! In this video, discover how astronomers read spectra to measure the vast distances of space. Download the video files. Credit: NASA, ESA, Dani Player (STScI).

Infrared light reveals new details in images, deepening our understanding of celestial objects. To explore what we can learn from other wavelengths of light, click through some of NASA's Universe of Learning ViewSpace Interactives.

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First, some objects are better observed in infrared wavelengths. Some bodies of matter that are cool and do not emit much energy or visible brightness, like people or a young planet, still emit infrared light. Humans perceive this as heat, while some other animals, like snakes, are able to “see” infrared energy.

Above each segment is a sine wave pattern indicating the relative wavelength of the band. The sine wave patterns are oriented vertically. The wavelengths increase from left to right. The wave pattern above Gamma is tightest (shortest wavelength). The wave pattern above Radio is more extended (longest wavelength).

Infographic titled “Electomagnetic Spectrum” comparing the wavelengths of light that can be detected by the Hubble, Webb, and Spitzer space telescopes.

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Visible light’s short, tight wavelengths are prone to bouncing off dust particles, making it hard for visible light to escape from a dense nebula. Longer wavelengths of infrared light slip past dust more easily, which means that instruments that detect infrared light — like those on Webb — are able to observe objects that emit light inside dusty clouds. Low-energy brown dwarfs and young protostars forming in the midst of a nebula are among the difficult-to-observe cosmic objects that Webb can study. In this way, Webb works to reveal a “hidden” universe of star and planet formation that is literally not visible otherwise.

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The diagram includes a horizontal bar consisting of seven labeled segments representing seven different bands of the electromagnetic spectrum. From left to right these are: Gamma, X-ray, Ultraviolet, Visible, Infrared, Microwave, and Radio. Gamma, X-ray, Microwave, and Radio segments are all colored in shades of gray. The Ultraviolet segment is various shades of purple. The Infrared segments is shades of red and orange. The Visible segment is rainbow, from purple on the left to red on the right.

Observations of these early days in the universe’s history shed light on perplexing questions of dark matter and dark energy, black holes, galaxy evolution over time, what the first generations of stars were like, and how we arrived at the universe we experience today.

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Below the wavelength bar are line sketches of three telescopes, labeled with the telescope name and wavelength range. From left to right: The Hubble Space Telescope has a wavelength range of 90 to 2,500 nanometers, corresponding to the right-most portion of the Ultraviolet segment, all of the Visible, and the left-most sliver of the Infrared segment. The James Webb Space Telescope has a wavelength range of 600 to 28,500 nanometers, corresponding to a sliver of red visible light and the left half of the Infrared segment. The Spitzer Space Telescope has a wavelength range of 3,000 to 160,000 nanometers, corresponding to the right half of the Infrared segment.

The rainbow of light that the human eye can see is a small portion of the total range of light, known in science as the electromagnetic spectrum. Telescopes can be engineered to detect light outside the visible range to show us otherwise hidden regions of space. The James Webb Space Telescope detects near- and mid-infrared wavelengths, the light beyond the red end of the visible spectrum.

Finally, infrared light holds clues to many mysteries from the beginning of everything, including some of the first generations of stars and galaxies in the early universe. Through a process called cosmological redshift, light is stretched as the universe expands, so light from stars that is emitted in shorter ultraviolet and visible wavelengths is stretched to longer wavelengths of infrared light.

Illumination is the discovery of the reality that exists beneath all forms and experiences.

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