By carefully studying the properties of the light given off by the blob shown in this photo, astronomers know that this one glows because it contains bright galaxies. Now, using a powerful telescope called the Very Large Telescope, which is based in a country in South America called Chile, astronomers are a step closer to solving the mystery. Another idea is that they are glowing because there are bright galaxies inside the blobs. One idea is that they glow when gas heats up as it is pulled in by a blob’s powerful gravity. But what is causing the blobs to glow is a mystery to astronomers. They are also some of the biggest objects in the Universe – these gigantic clouds of gas can be up to a few times bigger than the size of our galaxy, the Milky Way! Like a swarm of glow-worm insects, these blobs shine brightly. These blobs are incredibly rare and very far away in the Universe.
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