Night sky. We asked you what you could see in the sky at night. Chad Powell submitted these fantastic shots to the assignment. See more on GuardianWitness.

Credit: GuardianWitness/Chad Powell 

Meet the YouTube superstars

The revolution will not be televised but it’s already online, thanks to a new generation of self-made YouTube stars whose video blogs, music and sketches are gaining them huge worldwide audiences – and making them rich

Photo: Seven of the top YouTube creators, from left to right: Lex Croucher (tyrannosauruslexxx), Klaire De Lys (KlaireDeLys), Benjamin Cook (ninebrassmonkeys), Christopher Bingham (slomozo), Hazel Hayes (chewing sand), Shirley B Eniang (shirleybeniang), Thomas Ridgewell (tomSka) - find out more about them all here. Photograph: Richard Saker for the Observer

Some stunning shots from the environmental photographer of the year awards including this image by Florian Breuer of quiver trees by night in Namibia. Check out +environmentguardian for more.

The Brecon Beacons in Wales have won the status of “international dark sky reserve” – the fifth place in the world to gain the accolade from the International Dark-Sky Association. The site joins Mont Mégantic in Quebec, Exmoor national park in Devon, Aoraki Mackenzie in New Zealand and the NamibRand nature reserve in Namibia. Galloway Forest Park in Scotland is an “international dark sky park”

An international team of astronomers has created a vast, zoomable image of some nine billion pixels showing more than 84 million stars in the central ‘bulge’ of our home galaxy, the Milky Way. The image is so large that, if printed at the resolution of a picture in an ordinary book it would be 9 metres wide and 7 metres high. Click on the picture to see the image zoomed in

Photographer: ESO

Morning Tumblr!

Check out this beautiful display of aurora borealis (northern lights) enjoyed in the Lake District after strong solar activity reached earth’s atmosphere.

Photograph: Arctic-Images/Getty Images

Photograph: KeystoneUSA-Zuma/Rex Features

A new gallery of space pictures has arrived!

The annular eclipse is seen through binoculars which cast two images of the rarely seen ring of fire, Sacramento, California, 20 May 2012

Photograph: handout/Reuters

Our picture desk’s selection of the best news images of the day:

A mesmerising photo illustration provided by Nasa shows the sky at night just before the predicted merger between our own Milky Way galaxy and neighbouring Andromeda. Offering a glimpse into the future, the view is inspired by computer modelling of the collision about 4bn years from now - a merger that will form a single galaxy in about 6bn years


Eclipse over Idaho

Lovely picture! We have a whole gallery and I love this one too: