When a star weighing more than 20 times the Sun runs out of fuel, it collapses and turns into a black hole. But not all black holes are created equal. For BlackHoleWeek, check out the weird and wonderful black holes of our universe in this Tumblr blog:
, you spot some of your favorite constellations. But did you know there’s more to constellations than meets the eye? They’re not just a bunch of imaginary shapes made up of stars — constellations tell us stories about the universe from our perspective on Earth.is a named pattern of stars that looks like a particular shape. Think of it like connecting the dots. If you join the dots — stars, in this case — and use your imagination, the picture would look like an object, animal, or person.
The stars in constellations may look close to each other from our point of view here on Earth, but in space they might be really far apart. For example, Alnitak, the star at the left side of Orion’s belt, is about 800 light-years away. Alnilam, the star in the middle of the belt, is about 1,300 light-years away. And Mintaka, the star at the right side of the belt, is about 900 light-years away. Yet they all appear from Earth to have the same brightness.
! Though over a dozen stars make up Orion, two take center stage. The red supergiant Betelgeuse and blue supergiant Rigel stand out as the brightest members in the constellation.Betelgeuse is a young star by stellar standards, about 10 million years old, compared to our nearly 5 billion-year-old Sun.
Rigel is also a young star, estimated to be 8 million years old. Like Betelgeuse, Rigel is much larger and heavier than our Sun. Its surface is thousands of degrees hotter than Betelgeuse, though, making it shine blue-white rather than red. These colors are even noticeable from Earth. Although Rigel is farther from Earth than Betelgeuse , it is intrinsically brighter than its companion, making it the brightest star in Orion and one of the brightest stars in the night sky.
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