Starship Asterisk*

On December 27, 2014, while scanning the southern sky as part of the Dark Energy Survey, researchers snapped the above shot of comet Lovejoy. The image above was captured using the 570-megapixel Dark Energy Camera, the world’s most powerful digital camera. Each of the rectangular shapes above represents one of the 62 individual fields of the camera.

At the time this image was taken, the comet was passing about 51 million miles from Earth – a short distance for the Dark Energy Camera, which is sensitive to light up to 8 billion light years away. The comet’s center is a ball of ice roughly three miles across, and the visible head of the comet is a cloud of gas and dust about 400,000 miles in diameter.

Called by gods, driven by demons, slicing the night sky with dazzling brilliance, the night sky lights up like a war on the plains of Vígríðr.

Surrounded by turmoil , lashed by driving rain , this is the calm centre of the nights fury. High over the Lakes of Tekapo and Alexandrina we watch this amazing show.

A late call at the weekend we head down to Lake Tekapo for some astro shooting. The skies were clear when we started, by the time we arrived we had total cloud cover and rain.

After a good feed at the grill, we headed out to see what we could shoot.

Finding ourselves on a hill above Lake Alexandrina we noticed some lightning in the distance.

This turned into an epic light show , with many strikes every minute in every direction of the compass. We were literally in the eye of a huge storm.

The weather turned wild and we rode it out until heavy rain drove us into our tents.

I've never experienced the power and frequency of a storm like this!

Sadly in the early hours of Sunday morning the wind blew my tripod over and ended the life of my poor 6D.

[b][i]Credit: ESA/Hubble & NASA Acknowledgement: Gilles Chapdelaine[/i][/b]

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The galaxy pictured here is NGC 4424, located in the constellation of Virgo. It is not visible with the naked eye but has been captured here with the NASA/ESA Hubble Space Telescope.

Although it may not be obvious from this image, NGC 4424 is in fact a spiral galaxy. In this image it is seen more or less edge on, but from above you would be able to see the arms of the galaxy wrapping around its centre to give the characteristic spiral form.

In 2012 astronomers observed a supernova in NGC 4424 — a violent explosion marking the end of a star’s life. During a supernova explosion, a single star can often outshine an entire galaxy. However, the supernova in NGC 4424, dubbed SN 2012cg, cannot be seen here as the image was taken ten years prior to the explosion. Along the central region of the galaxy, clouds of dust block the light from distant stars and create dark patches.

To the left of NGC 4424 there are two bright objects in the frame. The brightest is another, smaller galaxy known as LEDA 213994 and the object closer to NGC 4424 is an anonymous star in our Milky Way. ...

[b][i]Credit: ESA/Hubble & NASA[/i][/b]

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Panta rhei is a simplified version of the famous greek philosopher Heraclitus' teachings. It basically means, everything flows. And everything in the Universe is indeed continually on the move, spiralling and shifting through space.

Some cosmic objects move a little further than others — take the subject of this NASA/ESA Hubble Space Telescope image, a globular cluster of stars known as Palomar 12.

Although it currently lies on the outskirts of the Milky Way’s halo, Palomar 12 was not born here. When astronomers first studied this cluster, they were puzzled by its strangely young age when compared to the other clusters in the galaxy. It appeared to be around 30% younger than other Milky Way globulars. Surely if it had been born within our galaxy, it would have sprung to life at a similar time to its cluster companions?

A bit more digging revealed that Palomar 12 was actually ripped from its initial home, the Sagittarius Dwarf Elliptical galaxy, around 1.7 billion years ago via tidal interactions between its former home and our galaxy. The dwarf galaxy that Palomar 12 once called home is a satellite galaxy to ours, and closely orbits around us — even occasionally passing through the plane of our galaxy. In fact, it is being slowly torn apart and consumed by the Milky Way.

The sparkling stars in this picture were imaged by Hubble’s Advanced Camera for Surveys.

Credit: NASA & ESA; Acknowledgement: Judy Schmidt ([url=http://geckzilla.com/]geckzilla.com[/url])

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In the centre of this image, taken with the NASA/ESA Hubble Space Telescope, is the galaxy cluster SDSS J1038+4849 — and it seems to be smiling.

You can make out its two orange eyes and white button nose. In the case of this “happy face”, the two eyes are very bright galaxies and the misleading smile lines are actually arcs caused by an effect known as strong gravitational lensing.

Galaxy clusters are the most massive structures in the Universe and exert such a powerful gravitational pull that they warp the spacetime around them and act as cosmic lenses which can magnify, distort and bend the light behind them. This phenomenon, crucial to many of Hubble’s discoveries, can be explained by Einstein’s theory of general relativity.

In this special case of gravitational lensing, a ring — known as an Einstein Ring — is produced from this bending of light, a consequence of the exact and symmetrical alignment of the source, lens and observer and resulting in the ring-like structure we see here.

Hubble has provided astronomers with the tools to probe these massive galaxies and model their lensing effects, allowing us to peer further into the early Universe than ever before. This object was studied by Hubble’s Wide Field and Planetary Camera 2 (WFPC2) and Wide Field Camera 3 (WFC3) as part of a survey of strong lenses.

A version of this image was entered into the Hubble’s Hidden Treasures image processing competition by contestant Judy Schmidt.