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Astronomical spectroscopyIntergalactic mediaLarge-scale structure of the cosmosLyman-alpha blobs

Lyman-alpha blob

Adapted from Wikipedia · Explorer experience

A stunning view of LAB-1, one of the largest known objects in space, glowing green due to intense ultraviolet light from distant galaxies.

What is a Lyman-alpha Blob?

A Lyman-alpha blob is a giant cloud of gas that shines with a special kind of light. These blobs are some of the biggest things we know in the Universe! Some are even bigger than our own Milky Way galaxy. They look like huge, glowing bubbles floating far away in space.

Where Do We Find Them?

Scientists find Lyman-alpha blobs only very far from us. Their light is very faint, but it changes in a way that lets it reach Earth's atmosphere. This change is called redshift. Because of this, we can only see them when their light stretches to longer waves.

Famous Lyman-alpha Blobs

Some famous Lyman-alpha blobs were found in the year 2000. One of the most well-known is called LAB-1. Others include Himiko and EQ J221734.0+001701, also called the SSA22 Protocluster. These amazing objects help scientists learn about how galaxies formed long ago.

Images

A stunning image of a giant cloud of glowing gas in space, illuminated by a supermassive black hole and young stars forming within a galaxy.

This article is a child-friendly adaptation of the Wikipedia article on Lyman-alpha blob, available under CC BY-SA 4.0.

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