December 31, 2025 Quick space links
Courtesy of BtB’s stringer Jay. This post is also an open thread. I welcome my readers to post any comments or additional links relating to any space issues, even if unrelated to the links below.
- Astronomers detect a three-galaxy merger, the third ever discovered
The headline at the link is utter garbage, designed as clickbait. The headline I have given you describes the story’s text accurately. One other detail: All three galaxies also appear to have active nuclei, suggesting the presence of supermassive black holes.
- SpaceX accounts for more than 70% of the world’s total payload mass launched in 2025
This graph is a nice additional data point I will use in my annual global launch report.
- On this day in 1924 astronomer Edwin Hubble announced that the spiral nebula Andromeda is a distant galaxy like the Milky Way
Thus proving that the Milky Way is just one of many galaxies in the universe.

