Cosmic Pursuits

Basic astronomy and night sky information

Brian Ventrudo

Emergent Crystals

by Brian Ventrudo Filed Under: Science

We normally cover really big things in these pages, things like planets, stars and galaxies. But the cosmos is ultimately built from very small bits and pieces that organize themselves on a tiny scale that are at least as beautiful as anything to be seen in the night sky. This video, created by Beauty of Science, shows at an accelerated pace the formation of six kinds of crystals out of solution. Whereas many astronomical objects coalesce because of gravity, these crystals are made from a beautiful interplay of electric forces, geometry, and quantum mechanics. Quite a beautiful sight!

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The Star of Good Fortune, and Old Age

by Brian Ventrudo Filed Under: Deep Sky

The star Canopus, low in the sky and left of center in this image, lies well below the constellation Orion, at top center, and Canis Major (at upper left). As seen from the Winter Star Party, near Summerland Key, Florida, in 2017.

Canopus is located in the southern constellation Carina, the Keel, and it is by far the brightest star in the constellation. At a declination of about -52o, Canopus never rises above the horizon for observers north of 38oN latitude. Many northerners catch sight of it while travelling south for winter vacation.  Almost directly south of Sirius, Canopus is just visible in the months of northern winter from southern Spain and Portugal, and from the southern United States. In the southern hemisphere, these two brightest stars are directly overhead in the evening summer sky [Read more…] about The Star of Good Fortune, and Old Age

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The Hyades Star Cluster

by Brian Ventrudo Filed Under: Deep Sky

The Hyades, below and left of center, and the Pleiades, two open star clusters in the northern zodiacal constellation Taurus. Image credit: Brian Ventrudo. Click to enlarge.

It’s the second-closest star cluster to Earth, and it appears so large that many new stargazers don’t even know it’s a true star cluster. But the Hyades, which make up the V-shaped head of the constellation Taurus, the Bull, is a resplendent collection of young, mostly blue-white stars that are lovely to the unaided eye and a wonder to behold in a pair of binoculars.

Often overshadowed by the smaller and more famous and apparently smaller Pleiades to the west, the Hyades are visible high in the northern sky this time of year. They’re visible from the southern hemisphere, too, perhaps 20° above the northern horizon just after sunset in South Africa, Australia, and New Zealand. An easy way to spot the Hyades? Follow a line from Orion’s Belt to the northwest until you see the little V with the bright orange star Aldebaran at one apex and keep going to get to the Pleiades. Follow Orion’s Belt in the other direction and you’ll find the bright blue-white star Sirius, the brightest star in the sky. The image below shows you what to look for [Read more…] about The Hyades Star Cluster

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A Quintuple Star in the Constellation Orion

by Brian Ventrudo Filed Under: Deep Sky

The complex of emission, reflection, and dark nebulae near the star Alnitak and Sigma Orionis. The Horsehead Nebula is at center. Sigma Orionis is the bright star to the left of the Horsehead. The pale white Flame Nebula, split in two by a dark lane of dust, is at bottom and just right of center. Image credit: Terry Hancock and GrandMesaObservatory.com 

Perhaps the finest multiple star in the sky visible to both northern and southern observers, Sigma Orionis is a gravitationally-bound system of five stars, four of which are visible upon careful inspection with a small telescope.  The brightest star of this group is one of the most luminous known, and it lights up the gas and dust around the famous Horsehead Nebula near Orion’s Belt. The star will one day expire, like many stars in Orion, in a spectacular supernova explosion.

Sigma Orionis doesn’t have an easy-to-remember name, but it’s not hard to find.  It’s just south of Alnitak, the easternmost star in Orion’s Belt.  The total visual magnitude is 3.6, so it’s visible even in light-polluted city skies [Read more…] about A Quintuple Star in the Constellation Orion

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