Christmas 2021 is past now, but you can still enjoy the daily astro advent images posted in the Bella Online Astronomy Forum. The final days of the countdown included images of a prize-winning aurora, a nebula that looks like a dolphin head and the Moon looking like an eyeball.

Christmas 2021 is past, but you can still enjoy the Astro Advent images posted in the Bella Online Astronomy Forum. The second eight days included a funny face, an Arctic fireball, and some winners from the Astronomy Photographer of the Year 2021 competition at the Royal Greenwich Observatory.

Christmas 2021 is past now, but you can still enjoy the daily astro advent images posted in the Bella Online Astronomy Forum. The first eight days of the countdown included the return of Comet 67P, a beautiful aurora in Canada, a strange spiral in the constellation Pegasus, and vivid skyscapes.

The Sun, the Moon, Mercury, Venus, Mars, Jupiter and Saturn are visible to the naked eye. People have seen them for thousands of years. Other Solar System bodies were discoveries, but who discovered them?

Imagine midnight on December 31 – fireworks, friendship and celebration greet a new year. But only if you follow the Gregorian calendar. In the past, a year often didn't start on January 1, and for nearly two billion people it still doesn't. So when does a new year begin?

No one alive had seen Venus transit when the 2004 one occurred. And if you missed that and the 2012 transit, there isn't another until 2117. However Mercury also transits the Sun – and these transits happen more often. But what's a transit and what do we learn from it?

Can the International Space Station and various satellites be seen from your house? If so, when and where should you look? What are the two bright stars you've seen around sunset time? The website Heavens-Above is a tool for beginners and experienced observers to answer questions like these.

On Christmas day 2003 a British-European space probe called Beagle 2 was lost on Mars and never heard from. It was not only small, but possibly broken and scattered while attempting to land. Since Mars is quite big, it took eleven years to find the little lander.

How tall are you? How far away is New York City? How far away is the Moon? How about the nearest planet, star, or galaxy? Do we measure them in inches, kilometers or light years? Find out why we choose some measuring units and not others.

Johann Elert Bode, the author of the greatest star atlas of the Golden Age of star atlases, is better known today for Bode's Law. Strangely, Bode's Law is neither a law nor original to Bode. So what was it? How did it inspire the Celestial Police? How did Neptune ruin it all?