The Astronomy feeds network includes many different feeds covering a range of astro topics.
Anyone can read them; if you're an astronomer, you can post to any of them by signing up via @bot.astronomy.blue.
Here's a thread of all of them:
Works just like the mobile app.
Install this app on your iPhone: tap the share button and then Add to Home Screen.
Tap the Share button
in Safari's toolbar
Select "Add to Home Screen"
from the menu
Tap "Add"
The app will appear on your home screen
Enter your Bluesky handle and app password to unlock posting, likes, and your Following feed.
Need an app password? Open Bluesky, go to Settings > App passwords, and create a new one.
Sign in with your Bluesky account to unlock posting, likes, and your Following feed.