Seyfert Galaxies(seyfertgalaxies.com)

51 points by kaycebasques 1 year ago | 4 comments

The Planets Today(theplanetstoday.com)

87 points by hyperific 2 years ago | 32 comments

Sky Map 2000 – Star Atlas and Planetarium(skymap2000.com)

27 points by m4c-pl 1 month ago | 4 comments

Real-time map of every Starlink satellite in orbit(starlinkmap.org)

237 points by fredrickd 2 years ago | 171 comments

Show HN: An homage to Tom Dowdy's 1991 screensaver, "Kaos"(thestrikeagency.com)

148 points by noduerme 1 year ago | 67 comments

Relativistic Spaceship(dmytry.github.io)

1008 points by thunderbong 2 years ago | 450 comments

An interactive browser simulation showing how a starfield looks from a spaceship accelerating toward the speed of light, with relativistic Doppler and time dilation effects.