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Halloween falls midway between an equinox and a solstice. In the ancient Celtic world it was the new year's eve and start of winter - time to prepare for survival in the darkening days. But also a time when the boundary between our world and the otherworld weakened. Who knew what might cross it?
Heavenly Aviaries - Bird Constellations
The night sky is full of starry birds. Here is a selection, ranging from the majestic swan to the exotic birds of the southern skies: the peacock, bird of paradise and toucan. There is also an emu whose image appears not in the stars, but in the dark nebulae.
Heavens-Above – website
You can see the International Space Station from where you live. But when and from which direction? What are the two bright stars you've seen after sunset? What's an Iridium flare? The website Heavens-Above is a tool for beginners and experienced observers to answer questions like this.
Henrietta Swan Leavitt
Henrietta Leavitt isn't a well known name, but a century ago she made one of the most important discoveries of 20th century astronomy. Previously, astronomers could only measure distances up to 100 light years, but her work extended that to 10 million light years.
Heroes of the Revolution – Doodles
For umpteen centuries people thought the Earth was the center of the cosmos. In the 2nd century AD, this view was the foundation for Ptolemy's Almagest and it persisted into the 18th century. But it wasn't unchallenged, there was a revolution in the making.
Herschel Museum of Astronomy
In 1781 William Herschel was the first person in history to discover a new planet. He was observing in the back garden of his home in Bath, England. The house where history was made is a museum and its new Caroline Lucretia Gallery is named for William's sister, the first woman to discover a comet.
Herschel Partnership - for Kids
The Herschels were one of the greatest astronomical families of all time. A partnership of two brothers and a sister built the best telescopes of their time, and with those telescopes mapped the deep sky. They changed the way astronomers understood the heavens.
Hidden Universe 3D – film
Hidden things intrigue, fire the imagination, and move us to uncover them. In "Hidden Universe 3D" you can see what powerful technology has made visible. And you can see it in 3D on a giant screen. A wonderful experience.
How Big Are the Biggest Stars
What is the biggest star yet discovered? It's harder than you might think to answer this question. But here's a short tour of big, bigger and absolutely enormous stars - including some impossible ones.
How the Sun Was Born – Facts for Kids
The Sun didn't exist five billion years ago. But the material to make it did. There was even enough to make a number of stars and still have material left over for planets, moons and other small bodies. What was this material, and how did it end up as stars and planets?
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