At its largest scales, the universe is made up of filaments made of “walls” of galaxy clusters. 10 billion light years long, the Hercules-Corona Borealis Great Wall is the largest known structure in the observable universe. Read more about the universe:
The surprises with exoplanets started in 1995 with 51 Pegasi b, the first planet to be discovered orbiting a main sequence star, the most common type of star in the galaxy, other than the sun. At about half the mass of, but orbiting closer to its star than Mercury does to our sun, it was the first so-called hot Jupiter – a gas giant that orbits scorchingly close to its host star.
We have since found over 1500 hot Jupiters, and the consensus is these planets have migrated in towards their star after forming in a more distant orbit. But while this is a large proportion of the 5000-odd exoplanets found so far, we shouldn’t overestimate how common they are.
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