Stellar Tour
Approach a black hole.
Fly in toward Cygnus X-1 and watch the starlight bend into rings around its shadow. Seven black holes, at their real places in your sky.
What you see
Seven black holes are in your sky at their real places: Cygnus X-1, V404 Cygni, Gaia BH1, Gaia BH3, A0620-00, Sagittarius A*, M87*. Fly in toward one and watch the starlight bend into rings around its shadow, while the disc of gas it is feeding on wraps over the top, traced through the same bent light.
Pull the dial from a thousand Schwarzschild radii in to three. Each black hole has its story: how it was found, and how heavy it is.
And the rest of the extreme universe
Around them are 22 more of the universe's most extreme objects at their real places, from pulsars and magnetars to quasars and the first gravitational waves, each with its page; a lesson, The extreme universe; and the High-Energy Sky, the whole sky in gamma rays and X-rays.
Where to find it
Search for any of them by name: Cygnus X-1, say, or M87*.
What is free
Search for any of them by name. Black holes up close and the rest of the extreme universe come with The Universe, the pack that also holds the 1.7 billion stars and the deep sky. Each pack is a one-time purchase inside the app, yours forever, not a subscription, with Family Sharing included; Everything is all three packs. If you bought Cosmic Expansion, you already own Everything.
More in Stellar Tour
The course · Eclipse Explorer · Observing Kit · The sky in 2027