The Famous Constellation of Orion will SOON DISAPPEAR from the SKY

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Orion Constellation is part of the Southern Hemisphere summer sky, and is a very constellation conspicuous almost every night. Easily visible by its shape in the sky, it is home to the well-known "Orion Belt", popularly called in Brazil as "The Three Marias". But just like any body in the universe, the stars that make up the constellation are in motion and will one day cease to exist because of that.

First, though they seem to be close to each other, Orion's stars are far apart. In the region where the Earth is located in the universe from the position of the stars of the constellation, they form the characteristic visual configuration every night. However, if you moved to another region of the Milky Way, the constellation would change shape due to the position that your eyes would be seeing the stars.

If the stars were static then the constellations would not change. But the stars, including the Sun, travel in separate orbits through our galaxies. The stars move at fantastic speeds, but they are so far apart that it takes a long time for their movement to be visible to us. You can understand this by moving your finger in front of your eyes. Even when you move it too slowly, it may seem to move faster than a high-speed plane that is many miles away.

This animation shows how Orion will change over the next 150,000 years.

The person who discovered that the stars move was the great British astronomer Edmond Halley, who also has a famous comet in his name. Almost 300 years ago, he noticed that some stars on maps made by observers of the Greek sky were no longer in the same place. Those letters were over 1600 years old, and even then, the bright stars Sirius, Arcturus, and Aldebaran shifted slightly. Still, it was enough for Halley to realize that those stars must have moved.

So yes, it is sadly incredible that not only Orion, but all visible constellations will disappear someday, creating other forms and new constellations in the heavens. But due to the apparently slow movement for us and due to the enormous distances, it will take a few thousand years to be visually felt.
[ NASA ]