Notices by Jason Nishiyama (evilscientistca@octodon.social)

Comets are icy messengers from deep in space. The short period comets (<100yrs) mostly originate from the Kuiper Belt beyond Neptune. The long period comets are thought to originate from the Oort Cloud, tens of thousands of au from the Sun. (46P/Wirtanen shown) #astrophoto

The small dark blobs inside this image of the Lagoon Nebula are Bok Globules. Inside these are where stars are formed. #astrophoto

In this field of ~25-30 thousand stars are about 50 calibration stars known as Landolt stars (after Arlo Landolt who calibrated them). These calibration stars allow different telescopes to measure magnitude consistently. Finding them is the glamour part of science they don't tell you about. #astrophoto