Since last Wednesday, Earth has passed the Perseids - the dust trail of Comet Swift-Tuttle.
It occurs annually and is noted for the spectacular meteor shower that then appears in the sky.
- The track basically consists of gravel.
When it enters the atmosphere, it burns up and we then see it as a shooting star, says Göran Östlin, professor of astronomy at Stockholm University.
The meteor shower reached its peak during the night towards Saturday and many Swedes stayed up late to catch a glimpse of the burning gravel.
Several readers have contacted us with pictures from last night, but most of the pictures depict a different light phenomenon.
Eric Stempels, a space scientist at Uppsala University, tells Aftonbladet that the time and trajectory in the sky are consistent with Space X's launch of a Falcon 9 rocket from California late on Saturday evening, Swedish time.
- It is very likely that it was the rocket people saw.
It would send up 46 satellites in different directions and they have confirmed that it was in a polar orbit.
It matches what I saw on my camera, he tells the newspaper.