Halos around the moon – or sun – are a sign of thin cirrus clouds drifting high above our heads.
FAQs
May 16, 2012
Space
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Next solar eclipse is an annular or ring eclipse on May 20-21. There’s also the transit of Venus on June 5-6. You’ll need solar filters, or indirect viewing method.
May 01, 2012
Earth
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People in the Middle Ages believed that May’s birthstone, the emerald, held the power to foretell the future.
May 01, 2012
Human World
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Happy May Day! A few words about this annual celebration, whose roots are in astronomy.
Apr 19, 2012
Space
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Meteors begin to “glow” almost as soon as they hit Earth’s atmosphere, but tend to vaporize (burn up completely) at varying altitudes.
Apr 17, 2012
Space
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That glow over the unlit part of a crescent moon – called earthshine – is light reflected from Earth.
Apr 11, 2012
Earth
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Sunlight that shines into a raindrop leaves that raindrop at an angle of 138 degrees from the path that the light traveled before it entered the drop.
Apr 05, 2012
Space
3 Comments
When we look toward a horizon, we’re looking through more atmosphere than when we look overhead. That’s why you see red sunsets.
Apr 02, 2012
Earth
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April’s birthstone, the diamond, is a symbol of enduring love.
Mar 15, 2012
Space
9 Comments
The brightness of Mars in our sky depends on where our two planets are in orbit around the sun.
