I'll create a cool web app that displays NASA's Astronomy Picture of the Day (APOD) with animations and an immersive space theme.

This web app features:

1. Immersive Space Theme:

   • Dark space background with animated twinkling stars
   • Gradient text and cosmic color scheme

2. NASA APOD Integration:

   • Fetches the Astronomy Picture of the Day from NASA's API
   • Displays images or videos with their descriptions
   • Shows metadata like date and copyright information

3. Interactive Features:

   • Date picker to select specific dates
   • Toggle for showing/hiding detailed information
   • Link to view full resolution images

4. Smooth Animations:

   • Loading states with animations
   • Smooth transitions between content states
   • Animated information panel

5. Responsive Design:

   • Works on all device sizes
   • Accessible navigation and controls

To use this app, you'll need to replace the DEMO_KEY with your own NASA API key for production use. You can get a free API key from NASA's API portal.