What happens if the Milky Way meets Andromeda?
Possible flybys and mergers, stellar orbits and gas. Why the forecast depends on transverse motion and how the 2025–2026 studies differ.
Articles: 3
Possible flybys and mergers, stellar orbits and gas. Why the forecast depends on transverse motion and how the 2025–2026 studies differ.
Sagittarius A*: how S2’s motion and the EHT ring reveal a central mass, and why an image of the shadow is not a photograph of the horizon.
The solar system in the disk and Local Arm: distance to the center, our inside view of the Galaxy, and the measurements used to build its map.