Aurora over Brooks Range in Alaska.

Image Credit: Photograph by © Fred Wasmer. All rights reserved.
A bright aurora appears over a homestead in the Brooks Range of northern Alaska on the morning of 23 March, 2015.
Fred Wasmer, Gainesville, Florida, United States of America
Member since 2014
Source: Aurora Over Homestead | Smithsonian Photo Contest | Smithsonian

‘Within Reach’ by Petr Horalek.

Honourable mention, Astronomy category
Within Reach by Petr Horalek.
The skies above ESO’s Paranal Observatory resemble oil on water as greens, yellows and blues blend to create an iridescent skyscape.
The rocky, barren landscape below evokes an alien world, complementing the cosmic display above
Image Credit: Photograph by Petr Horalek/PA.
via Royal Society Publishing Photography competition 2017 – in pictures | Art and design | The Guardian

Incredible View of Earth and Moon from Mars.

Photographic Image by NASA/JPL-Caltech/Univ. of Arizona
During a recent calibration exercise, NASA’s Mars Reconnaissance Orbiter captured a remarkable view of Earth and its moon from a distance of 127 million miles (205 million kilometers).
It’s so clear, you can even make out our planet’s continents.
To calibrate the HiRISE camera aboard the Mars Orbiter, NASA scientists needed to scan an object other than the Red Planet.
Seeing as Earth is right next door, that was an obvious choice.
The image is a combination of two separate exposures taken on November 20, 2016, and have been moderately adjusted to make both objects appear equally as bright (otherwise the Earth would have appeared too dark).
The combined view shows the correct positions and sizes of the two celestial bodies relative to each other.
Source: Incredible New Image Shows the Earth and Moon From Mars

Sunset over southern Atlantic Ocean by Johnson Space Center.

The Earth Science and Remote Sensing Unit at NASA’s Johnson Space Center picks this year’s top 16 photos of Earth from the International Space Station.
A sunset over the southern part of the Atlantic Ocean.
Image Credit: Photograph by Johnson Space Center/NASA
Source: See NASA’s Top 16 Earth Images of 2016 – The Washington Post

Milky Way over Bonnie Doon, Victoria.

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Milky Way over Bonnie Doon, a small town in Victoria was a finalist in the 2016 David Malin Astrophotography awards.
Image Credit: Photograph by Neil Creek/neil@neilcreek.com
Source: Our favourite Australian photos of 2016 | Australia news | The Guardian

Star Trails over Bourke, New South Wales.

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Image Credit: Photograph by Ron Pantekoek.
“This is a composite image consisting of 150 images to create the star-trails, one image for the truck ‘moving’ head and tail lights, and one for the foreground.
All images were taken on the same night just outside the city limits of Bourke, New South Wales, Australia, and took several hours to make.”
Source: Your pictures: Best of 2016 – BBC News