M4 - White Dwarfs - Deep Sky Videos @DeepSkyVideos

Uploaded May 2012 | Updated September 2026, 2 weeks ago

M4 (Messier 4) is a globular cluster. Its proximity to Earth has made it an interesting target over the years. Messier object playlist: bit.ly/MessierObjects

Featuring Dr Meghan Gray from the University of Nottingham.

More on the people who let us use their images: deepskyvideos.com/pages/image_contributors.html

Deep Sky Videos website: deepskyvideos.com
Twitter: twitter.com/#!/DeepSkyVideos
Facebook: facebook.com/DeepSkyVideos
Flickr: flickr.com/photos/68847473@N02
More about the astronomers in our videos: deepskyvideos.com/pages/contributors.html

Videos by Brady Haran

Editing in this film by Stephen Slater

$Why are stars spiky? - Deep Sky Videos Why do photos of stars often have spiky, pointy bits of them? These are called diffraction spikes and some people even add them artificially! Here are explained by Professor Mike Merrifield (University of Nottingham) and Nik Szmanek (astrophotographer). Mike tweets at https://twitter.com/ProfMike_M Some image credits: Philip Perkins: www.astrocruise.com/ Nik Szymanek: http://ccdland.net Fred Espenak: http://astropixels.com Deep Sky Videos website: http://www.deepskyvideos.com/ Twitter: https://twitter.com/#!/DeepSkyVideos Facebook: http://www.facebook.com/DeepSkyVideos Flickr: http://www.flickr.com/photos/68847473@N02/ More about the astronomers in our videos: http://www.deepskyvideos.com/pages/contributors.html Videos by Brady Haran A run-down of Bradys channels: http://periodicvideos.blogspot.co.uk/2012/06/here-are-my-channels.html$

M52 - A Cluster of Variable Stars - Deep Sky Videos

M93 - Caroline Herschel - Deep Sky Videos

M76 - Little Dumbbell Nebula - Deep Sky Videos

The Story of Galaxy Clusters (and Abell 1) - Deep Sky Videos

Dark Matter and Aliens in NGC 2403 - Deep Sky Videos