Year 2021, Month 04
- 01: Rocket Launch as Seen from the Space Station
- 02: NGC 3521: Galaxy in a Bubble
- 03: Ingenuity on Sol 39
- 04: In, Through, and Beyond Saturn's Rings
- 05: Veil Nebula: Wisps of an Exploded Star
- 06: Mars and the Pleiades Beyond Vinegar Hill
- 07: Threads of NGC 1947
- 08: 3D Ingenuity
- 09: Messier 106
- 10: Zodiacal Night
- 11: When Black Holes Collide
- 12: Alnitak and the Flame Nebula
- 13: Confirmed Muon Wobble Remains Unexplained
- 14: The Pencil Nebula Supernova Shock Wave
- 15: The Galaxy, the Jet, and a Famous Black Hole
- 16: The Doubly Warped World of Binary Black Holes
- 17: Inside the Flame Nebula
- 18: Rainbow Airglow over the Azores
- 19: The Galactic Center in Infrared
- 20: Ingenuity: First Flight over Mars
- 21: Centaurus A's Warped Magnetic Fields
- 22: Planet Earth at Twilight
- 23: Flying Over the Earth at Night II
- 24: Streak and Plume from SpaceX Crew-2 Launch
- 25: Planetary Nebula Mz3: The Ant Nebula
- 26: A Sagittarius Triplet
- 27: Animation: Black Hole Destroys Star
- 28: North Star: Polaris and Surrounding Dust
- 29: Apollo 17: The Crescent Earth
- 30: Pink and the Perigee Moon