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Lagoon Nebula (M8)
Barely visible to the unaided eye, Messier 8 (M8) – the Lagoon Nebula – lies about five thousand light years away in the constellation Sagittarius. It's over a hundred light years across, an enormous turbulent stellar nursery.

Astronomy Photographer of the Year 2018
2018 was the 10th anniversary of the Astronomy Photographer of the Year awards. The Royal Observatory Greenwich first hosted them in 2009. But this year the event was in the National Maritime Museum, and the 2018 images - plus some great past winners - are on exhibition in a brand new gallery.

Libra the Scales
Lying between Virgo and Scorpius in the zodiac, Libra is an ancient constellation. The stars now represent a weighing scale, as they did four thousand years ago in Babylon. But how did its brightest stars come to have names related to a scorpion's claws?

Autumn Equinox to Halloween – Quiz
Autumn equinox and autumn sky, discoveries and discoverers, an ancient festival that marked the transition from the light to darkness. Can you identify them?

Search for Earth's Twin – book review
Years ago, if you weren't serious about being an astronomer, a good career-killer would have been hunting for exoplanets. It's different now. Stuart Clark tells the story from the first discovery of a planet orbiting another star to the current Search for Earth's Twin.

Mimas – Death Moon of Saturn
Mimas is named for a giant in Greek mythology, but Saturn's moon is no giant. It's less than 400 km (245 mi) across and the smallest body we know of that's rounded by gravity. The moon also has a bizarre resemblance to the Death Star in George Lukas's Star Wars films.

Sun and Moon and the Calendar
If you look at your calendar to find today's date, you can see the month, days of the week and maybe some appointments. But you're also looking at something that tracks Earth's journey around the Sun, reflects three thousand years of history and helps to hold our society together.

Dorado and Volans – Facts for Kids
Flying fish live in warm oceans, and so do the mahi mahi fish. Sailors in the southern seas saw the flying fish using their side fins like wings to glide through the air – sometimes chased by hungry mahi mahi. Dorado (Mahi mahi) pursues Volans (Flying fish) in the stars of the southern sky.

Moon Phases and Eclipses – Help for Teachers
Moon phases and eclipses are easily seen, but rather abstract to understand. The first section of this article lists the basic concepts with some links to diagrams. The sections that follow suggest resources for teachers, both lesson plans and short videos available online.

Exoplanets - Hottest, Darkest, Oldest
Our Solar System was the only one we knew. Astronomers used it to explain how star systems were made. But beware the theory based on only one example! We now know of thousands of planets around other suns, and the theories need revising. Here are a few of the astonishing planets we've found.

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