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FU Orionis

The big young star hasn't reached the main sequence yet. It will continue to shrink and meanwhile heat up.
In the year 1936 it suddenly appeared in the sky, before it was an undiscovered tiny star of 16. magnitude. But it wasn't a nova, the star kept its new magnitude. What happened was the following: the dust disk around the star came closer to it, heated up, ionized and to a part fell down on it. The disk began to glow and let pass the light better than before.

Constellation: Orion
Distance: 1600 light-years
Spectral class: G0
Visual magnitude: 9.5
Luminosity: 80 * Sun

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