Extreme object

Geminga

Geminga is a pulsar 815 light-years away, turning 4.22 times a second.

A pulsar found by its gamma rays alone, in 1972, and unidentified for twenty years. Its name is Milanese for 'it is not there'.

Key facts

Kind

Pulsar

Distance

815 light-years

Turns once every

237.00 milliseconds

See it from here

Too faint for the eye; a telescope, or a long photograph, shows it.

How the map draws it

Drawn as a ring at its measured distance; a black hole has no shape to draw and a pulsar is far too small — the kind of thing, not this exact one · its blink is drawn 10 times slower than it turns, so that an eye can follow it.