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Canis Major

Image of Sirius_A_and_B
Stars

The Other Sirius Mystery: Red or White

Today Sirius, the brightest star in the night sky is an unmistakable blue-white in colour although it does twinkle a lot and can appear to change colour. However no one would think of describing it as red.It is thus a source of confusion that many ancient writers describe the star Read more…

By Armagh Observatory and Planetarium, 11 yearsApril 27, 2012 ago
Star types from left to right: a red dwarf, our Sun, a blue dwarf, and R136a1 (hypergiant). Where star sizes are measured by radius, from centre to surface, and where 1 solar radius is equal to that of our Sun (km) - R136a1’s radius is 35.4 times greater than the Sun [approximately 24.8 million km]. Credit: Author: ESO/M. Kornmesser
Stars

The Largest Stars in the Universe

How big is the largest known star? Compared to planets, stars will always be the overall group winners in terms of superior size. When you look at the night sky on a clear night and away from city lights, you will see that there are stars of varying sizes and Read more…

By Armagh Observatory and Planetarium, 11 yearsMarch 14, 2012 ago
March

Wonders of the March Night Sky

At the beginning of March look west just after sunset to see three of the ‘wandering stars’.  Mercury will be close to the horizon, with Venus and Jupiter shining brightly above it. Mercury will quickly set below the horizon and by the middle of the month will have disappeared from Read more…

By Armagh Observatory and Planetarium, 11 yearsMarch 2, 2012 ago
Image of crescent moon
February

Wonders of the February Night Sky

If you look towards the west just after sunset this February you will see a very bright star in the darkening sky. Known as the Evening Star, brilliant Venus steals the celestial show. After the Moon, Venus is the next brightest object in the sky. Higher in the heavens and Read more…

By Armagh Observatory and Planetarium, 11 yearsJanuary 30, 2012 ago
Monthly Sky Notes

Sirius: a Winter Sky Wonder

Which is the brightest star in the sky (apart from the Sun)? Many non-astronomers believe that the Pole star (Polaris) is the brightest star but there are at least forty brighter stars. The correct answer is Sirius, a wonder of the winter sky.   Finding Sirius in the winter sky Read more…

By Armagh Observatory and Planetarium, 11 yearsDecember 5, 2011 ago

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RSS Intergalactic Craic
  • S3Ep1 - Wee Bitta Craic: Welcome Ethan, Alice and Zuri!
    Want a Wee Bitta Craic? Then say hello to some of our PhD students, Ethan, Alice and Zuri. They will be hosting their own Wee Bitta Craic episodes and will give you an insight into the life of a PhD students here at AOP!
  • Season 3 - What's the craic?
    What's the Craic? Intergalactic Craic is back and it's shaking things up! Join Heather and her brand new co-host to find out more!
  • Space is Cloudy, Who Knew? Featuring Kerem Çubuk
    This week Heather and Courtney interview Armagh Observatory PhD Candidate Kerem Çubuk on his area of research - molecular clouds! Turns out we can't escape the cloudy conditions, even millions of lightyears away.  Kerem and his colleagues also have a Youtube Channel dedicated to science communication in Turkish. To find out more, visit ahtapot.club 
Welcome to Astronotes

Hello and welcome to Astronotes, the Armagh Observatory and Planetarium’s official blog. Here you will find the latest news and views from all those who work in our organisation, from the fascinating worlds of astronomy and space exploration. We hope you will come here to learn what is hot and exciting, profound or even weird from worlds beyond ours . So that's the introduction out of the way, now on with the Universe!

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