starlink satellite trains

Starlink is a constellation of 7,078 (as of 01.03.2025) satellites in low earth orbit that provide internet services worldwide, especially in remote areas. The first satellites were launched in 2019 and the constellation continues to grow to this day. It is not clear how many operational units the owner (Starlink Services LLC) intends to put … Read more

aurora borealis

A geomagnetic storm of level G5 on NOAA’s G-scale, triggered by a coronal mass ejection, caused northern lights to be visible as far south as southern Florida and the Mediterranean region on 11.05.2024. The storm hit Germany under favourable conditions: There was no disturbing moonlight and the weather was excellent. From the north of Wiesbaden, … Read more

c/2023 a3

C/2023 A3 passed through its perihelion on 27.09.2024, after which its absolute brightness steadily decreased. It reached its smallest distance to Earth on 12.10.2024 and I was able to see it effortlessly as a bright object on the western horizon for the first time on the evening of 13.10.2024. However, I didn’t have a camera … Read more

the moon

To the human eye, the moon appears – apart from a more or less yellowish to reddish coloration caused by the Earth’s atmosphere – colorless or monochromatic. The surface of the moon is characterized by the lighter terrae (crater-saturated highlands) and the darker maria (“seas” – lava-filled large impact basins).The image below shows the moon … Read more