NASA makes 1st precise distance measurement to star cluster
Astronomers using NASAâs Hubble Space Telescope have for the first time precisely measured the distance to one of the oldest objects in the universe, a globular star cluster called NGC 6397, born shortly after the Big Bang. The new measurement, estimated using the âspatial scanningâ technique, sets the clusterâs distance at 7,800 light-years away, with only 3% margin of error.