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A mile above the California desert stands Palomar Observatory. Its 200-inch mirror was officially impossible to make, but George Ellery Hale's vision inspired a nation in the grip of the Great Depression and it became the jewel in the crown of astronomy for the second half of the twentieth century.
Pegasus the Winged Horse
A flying horse on feathered wings - it's the constellation Pegasus. You can spot it by its most noticeable feature, the Great Square of Pegasus, though one star of the square belongs to poor Princess Andromeda. There's also a star in Pegasus very like our Sun with a planet circling it.
Perseus the Hero
Perseus was a first-class hero: a demi-god, monster-slayer, maiden-rescuer, founder of Mycenae. When he died the gods put him in the sky. His constellation contains beautiful nebulae, a demon and a singing black hole.
Phantom Planets and Moons
Moons of Venus and Mercury? An unknown planet nearer the Sun than Mercury? Astronomers can misinterpret what they see, too. Happily, other observers, better instruments and new theoretical understandings can put it right. Here are some phantom objects that many astronomers once thought existed.
Photography and the Birth of Astrophysics
Saturn's rings, spiral galaxies, solar flares. Astrophotography has shown us some wonderful images, but it's more than pretty pictures. It has allowed us to discover objects too dim for the human eye to see. Partnered with spectroscopy, it moved astronomy from mapping to understanding the stars.
Pleiades - the Seven Sisters
The Pleiades - the Seven Sisters - were shown in star catalogs six thousand years ago. Visible from northern and southern hemispheres, probably every culture that ever watched the sky had a name for them. But what is this group of stars? And are there actually seven of them?
NASA's New Horizons is on its way to visit Pluto, but it has a long way to go yet. Meanwhile here's a profile of dwarf planet 134340 Pluto, largest object in the Kuiper Belt and former planet. It has a lot of titles - and moons - for something so small.
Pluto Facts for Kids
A dwarf planet so far away that the Sun would look like a exceptionally bright star, so cold that its atmosphere is frozen for most of its year. This is Pluto, former planet, and now the gateway to the Kuiper Belt.
Pluto Is a Dwarf Planet
Some people are still upset that Pluto isn't considered a planet any more. But was it ever really a planet?
Polaris - 10 Fascinating Facts
Today we travel paved roads using good maps or a GPS system to find the way. Imagine sailing uncharted waters or journeying through trackless deserts without such help. In the northern hemisphere one of the greatest of navigational aids has for nearly two thousand years been the north star Polaris.
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