sci-universe:

Comet Halley – the most famous comet of all human history

Halley’s Comet is visible from Earth every 75–76 years, making it possible for a human to see it twice in his or her lifetime. It last appeared in the inner Solar System in 1986 and will next appear in mid-2061.

Halley’s returns to the inner Solar System have been observed and recorded by astronomers since at least 240 BC. Clear records of the comet’s appearances were made by Chinese, Babylonian, and medieval European chroniclers, but were not recognized as reappearances of the same object at the time. The comet’s periodicity was first determined in 1705 by English astronomer Edmond Halley, after whom it is now named.

Images above show the comet’s apparition of 1986, 1910, 1835 and 1070s.

sci-universe:

The heart of the Rosette Nebula and its details

In the heart of the Rosette Nebula lies a bright open cluster of stars that lights up the nebula. The stars of NGC 2244 formed from the surrounding gas only a few million years ago. The above image taken in January using multiple exposures and very specific colors of Sulfur (shaded red), Hydrogen (green), and Oxygen (blue), captures the central region in tremendous detail. A hot wind of particles streams away from the cluster stars and contributes to an already complex menagerie of gas and dust filaments while slowly evacuating the cluster center. The Rosette Nebula’s center measures about 50 light-years across, lies about 4,500 light-years away, and is visible with binoculars towards the constellation of the Unicorn (Monoceros). [via APOD]

Image by Don Goldman

spacettf:

The Rho Ophiuchi Cloud Complex by gatoth on Flickr.

Tramite Flickr:
Being one of the most colourful part of the sky, the Rho Ophiuchi Cloud Complex is a perfect target for astrophotographers having access to southern skies.

This region is quite rich in nebulae, all sorts of them can be…

Exposure time: 7h 10m (86x5min @ISO800)
Telescope: SkyWatcher Quattro 10” F/4 Astrograph (modded)
Telescope mount: SkyWatcher NEQ6 (modded)
Camera: Canon EOS 450D

You can find high-resolution image and more details about the picture on my website at astro.i-net.hu

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