This should be Milsky. You can search or follow feeds at the hashtag at the bottom of the screen. If you click on my profile I just shared some threads about science-minded folks getting started on BlueSky (there’s a database of sci-related feeds!) if you prefer. bsky.app/profile/did:...

You can “pin” (like a pushpin icon 📌 ) feeds you like to be ones you see regularly, then they’ll be at the top of your home screen to slide left or right to, and they’ll be listed at the # tab at the bottom bar of your screen.