Tiny, far-flung Pluto is about to have a visitor — at least for a few hours.
On July 14, NASA’s New Horizons spacecraft will reach the dwarf planet and try to learn all it can about Pluto and its five known moons. Then the probe will leave Pluto behind, vanishing into the frigid darkness beyond the planets.
In its wake, New Horizons will introduce Earth to the...
The next really big observatory won't sit on a mountaintop or out in the desert. Nor will it fly aboard a spacecraft.
Astronomers seeking the best views of the heavens have traditionally trekked to such remote outposts as the top of an extinct volcano in Hawaii or a desert in northern Chile. When they have needed to observe, say, one patch of sky over a broad range...