Philip Plait's new book, Under Alien Skies, is a bewitching cosmic ride through the solar system and beyond.
Why is the sky blue? I remember asking my parents that question as a kid. When the sun’s rays hit the blanket of air that encircles the Earth, they told me, blue light scatters more than other colors. Despite my fascination with the cosmos, I never thought to ask what the sky would look like on other worlds., is a bewitching cosmic ride through the solar system and beyond, transporting readers aboard futuristic starships to discover what the sky might look like above faraway landscapes.
Contrary to what some articles on the internet say, the sun would not look like any other star in the sky. Standing on Pluto, the sun would appear one-fiftieth its size from Earth’s viewpoint. But it would blaze as a “painfully bright” dot, Plait writes, about 160 times as bright as the moon looks to us, and it would have a faint, deep-blue halo because Pluto’s thin air scatters short, blue wavelengths of light.
Jetting to the smaller lobe, Plait points out a metal pole jutting from the rocks. The pole is attached to a box, turned off-kilter. It’s Philae,
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