Event horizon
Flight readings
1× is the horizon. Below 1× is inside.
The horizon's radius is 12.70 million km. This compares your radial coordinate with that radius, not the distance a ruler would measure in curved space.
Time on your watch since the flight began.
0 minutes and 0 seconds have passed for you. Your watch ticks normally, even across the horizon. We stretch the playback near the center, so screen time and onboard time differ. The countdown in the status bar shows time still left.
Difference in gravity across a 2 m body.
Your feet are pulled harder than your head when they point toward the center. This difference stretches you. Higher means stronger stretching; halving the radius makes it eight times stronger. This measures the difference in acceleration, not your speed.
Approaching black hole
Gravity carries you inward. Watch the starfield bend around the shadow.