Hubble and the Hidden History of Andromeda Galaxy #SpaceSaturday
The James Webb Space Telescope has stepped onto center stage. But fhe value of the venerable old Hubble Telescope will never be lost, becuase its stunning images still deliver. Here’s more form Astronomy Now:
With Hubble we can get into enormous detail about what’s happening on a holistic scale across the entire disc of the galaxy. You can’t do that with any other large galaxy,” said principal investigator Ben Williams of the University of Washington. Hubble’s sharp imaging capabilities can resolve more than 200 million stars in the Andromeda galaxy, detecting only stars brighter than our Sun. They look like grains of sand across the beach. But that’s just the tip of the iceberg. Andromeda’s total population is estimated to be 1 trillion stars, with many less massive stars falling below Hubble’s sensitivity limit.
Photographing Andromeda was a herculean task because the galaxy is a much bigger target on the sky than the galaxies Hubble routinely observes, which are often billions of light-years away. The full mosaic was carried out under two Hubble programs. In total it required over 1,000 Hubble orbits, spanning more than a decade.
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