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NASA Probe Makes Surprise Discovery About Cosmic Dust
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Mars dust storms may cause eerie zodiacal light in Earth s night sky
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If you’ve ever rolled out of bed before dawn – or rolled home at that time – and were surprised to see the sky lit up in a strange way without any hint of the sun creeping up over the horizon, you were most likely witnessing an appropriately named phenomena known as a “false dawn.” If the light looks triangular, you’re not hallucinating (OK, you might be, but that’s your problem) – that’s the shape it takes. And if you’re afraid to tell anyone else because they might think you’re crazy, they probably already do – but you’re in good company … the ‘false dawn’ has been reported pre-Columbian Mesoamericans, astronomers as early as the 1600s and even the prophet Muhammed. They all asked the same question you probably did: “What IS that?” Good news – unlike them, you’re about to find out … and it’s not of this Earth.
Space dust has been found to be concentrated in ways consistent with it coming from Mars. This could overturn theories on the origins of the phenomenon known as zodiacal light. Even though the evidence comes from a space probe, it s not any of the probes sent to the red planet. Instead, the phenomenon has been revealed through an unexpected application of the Juno spacecraft s solar panels.
Under the right conditions, just after sunset or shortly before dawn, it is possible to see a faint, almost triangular glow in the sky known as the zodiacal light. The light is a product of space dust reflecting the Sun s rays. We see it only in parts of the sky because the dust is concentrated in bands close to the plane in which the planets orbit the Sun.