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Gravity - Cosmic Glue
Aristotle's perfect cosmos didn't need gravity to hold it together. However a system with planets orbiting the Sun called for an explanation. In the process, Newton was inspired by a falling apple, but Galileo's experiments with falling bodies didn't involve dropping them off the Tower of Pisa.
February second is Groundhog Day, a day that's a mystery to people outside North America. Even in the USA and Canada, it's more a bit of fun than a holiday. Yet however superficial it is now, it's the offshoot of traditions that began in Europe thousands of years ago.
Every 75 years or so a very special member of the Solar System swoops close to the Sun, becoming visible in our skies like a cosmic ghost. Read about Halley’s Comet, the most famous comet of all.
Halley's Comet for Kids
It visits every 75 years or so, appearing like a celestial ghost in our skies. In the past it has been a bad omen and scary object, but last time it came it was a big event around the world. What is it? Halley's Comet, the most famous comet of all.
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.
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 the greatest astronomical family 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.
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