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What color would the sky be without an atmosphere?
Black, even in the daytime. With no air to scatter sunlight, the Sun is just a bright dot in a black sky, and you can see stars at noon. Physics 3.
The Duowenwen team · Updated
Without an atmosphere, the sky would have no color at all. This is the third question in the middle school physics chain of the question map. The first two were "Why is the sky blue?" and "Then why are sunsets red?"
What color would the sky be without an atmosphere?
Black, even in the daytime. With no air to scatter sunlight, when you look up all you'd see is the Sun itself, a dazzling dot, with a black sky all around it and stars visible in broad daylight. That's how it is on the Moon. In the photographs astronauts took on the lunar surface, the sky is completely black.
What if…?
This chain is yours to carry on from here. Why are shadows on the Moon so black? And why can you still see things inside a shadow on Earth?
Next: type your own "What if…?" into Duowenwen and it will pick up from here.