Should disambiguate from https://astro.build/ and various other name collissions in your title somehow, maybe "Astro App | Explore the Night Sky" ?

Also the "Identifiers" section and some other things have extremely low contrast text, 2.35:1 instead of the recommended 4.5:1 for body-size text. You can check on issues like this using the accessibility tab in Firefox or Lighthouse in Chrome.