Rainbow Airglow over the Azores

Image Credit & Copyright: Miguel Claro (TWAN); Rollover Annotation: Judy Schmidt

apod.nasa.gov/apod/ap210418.ht #APoD

M87 is a large elliptical galaxy in the constellation of Virgo. It has a large supermassive black hole at its centre, a jet of which can be seen in the second image.


The Doubly Warped World of Binary Black Holes

Scientific Visualization Credit: NASA, Goddard Space Flight Center, Jeremy Schnittman and Brian P. Powell - Text: Francis Reddy

apod.nasa.gov/apod/ap210416.ht #APoD

M104, sometimes called the Sombrero Galaxy, is a spiral galaxy in the constellation Virgo. Seen close to edge-on, a prominent lane of dust is visible along the edge of the disk.

M63 is a spiral galaxy in the constellation of Canes Venatici. In the optical spectrum it appears as a flocculent spiral, without well defined spiral arms. In the infrared part of the spectrum it does show defined spiral arms however.

Confirmed Muon Wobble Remains Unexplained

Image Credit: Fermi National Accelerator Laboratory; Photographer: Reidar Hahn

apod.nasa.gov/apod/ap210413.ht #APoD

The Double Cluster in the constellation of Perseus is a spectacular sight in a set of binoculars or a small telescope. The two clusters of NGC 869 and NGC 884 don't only appear close together in the sky, since they're both at the same distance they're close to each other in space

The Horsehead Nebula is a dark nebula. We can only see it because it is blocking some of the light from the emission nebula behind it and we see it as a silhouette. Bonus:the star in the upper left is partially embedded in the dark nebula creating near it a blue reflection nebula

M77 is a barred spiral galaxy located about 47Mly away in the constellation of Cetus. It is also classified as an AGN (active galactic nucleus) galaxy, meaning there is a supermassive black hole at the centre of the galaxy that is currently consuming dust and gas.

NGC 2024, also known as the Flame Nebula, is an emission nebula in the constellation of Orion. The bright star in the image is Alnitak, the eastern most (left in the N hemisphere) star in Orion's belt. The nebula is a star forming region.

M6 is an open cluster located about 1600ly away from us in the constellation Scorpius. A young cluster, it's estimated age is only 94 million years. The blobbiness of the image is due to the low altitude of M6 from the telescope's location so imaged through much atmosphere.

And camping in the trailer in the back yard because child...

M33 is a large spiral galaxy that is a member of the Local Group of galaxies with our Galaxy and M31; as well as many smaller galaxies.

This image of the globular cluster M70 shows what happens when you look through a lot of atmosphere. At less than 7° above the horizon from the site this was taken at, you are looking through almost 5 times as much air than at the zenith. Makes for really bad seeing.

M72 is a globular cluster located about 66kly away in the constellation of Aquarius. Like yesterday's M75, M72 is also on the other side of the Galaxy with the core between us.
We don't have a good handle on how globular clusters form, an area of active research.

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