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