Tag: Light
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Can anything break light speed?
The Tweet: “In some instances, darkness moves faster than light.” It is possible for darkness to move faster than light. In this Friday long read we explain how this can happen and why something moving faster than the light barrier still fits with our understanding of the universe. But first, what is the speed of…
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This is the real reason night vision goggles are green
The Tweet: “Night vision goggles are green because the human eye can tell difference between more shades of green than any other color.” There are three popular types of night vision including thermal imaging and near infrared illumination. But this tweet refers to one of the more popular forms; low light imaging using image intensifiers.…
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Atmospheric ice causes sun halos
The Tweet: “When you see a halo around the moon or sun, that means a storm is coming.” Halos around the sun or moon are caused by light refracting through ice crystals in the Earth’s atmosphere. The crystals are found in cirrus clouds 20,000 feet above the Earth’s surface – the highest of the main cloud…