This is the twentyeighth episode of our ongoing series about the constellations. In this episode, we examine the largest constellation in the sky, Hydra, and discuss a gravitational wave event observed in 2017 that appear to be the death rattle of two merging neutron stars.

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Planetarium visuals were created using Digistar 6 by Evans & Sutherland.

Image Credits:

Southern Pinwheel Galaxy, Messier 83
CTIO/NOIRLab/DOE/NSF/AURA
Acknowledgment: M. Soraisam (University of Illinois)
Image processing: Travis Rector (University of Alaska Anchorage), Mahdi Zamani & Davide de Martin

M68
ESA/Hubble & NASA

M48
"Messier 48" by Stephen Rahn is marked under CC0 1.0. To view the terms, visit https://creativecommons.org/licenses/...

NGC 4993 Kilonova
NASA and ESA

Video Credits:
Both videos concerning GW170817
NASA's Goddard Space Flight Center/CI Lab


Music Credits:

"To The Great Beyond" from the album "Between The Rings" by the artist Stellardrone. The song has been modified in length from the original. Music is used here under a Creative Commons 3.0 Attribution Unported License.

stellardrone.bandcamp.com/album/betweentherings
creativecommons.org/licenses/by/3.0/