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Day and night are caused by the rotation of the Earth: when you're on the side away from the Sun, that's night; when you're on the same side as the Sun, that's day.

If you are in space but orbiting the Earth, depending on the orbit, there will probably be times when the Earth blocks the Sun for you and times when it does not. You could call those "day" and "night" if you wanted to, but orbital speed is quite a bit more than rotational speed until you get quite high, so your "days" and "nights" will be very short.

If you're out in space on another planet, then you've got day and night again, though to avoid confusion the term "sol" is used rather than "day". A Martian sol is about 40 minutes longer than an Earth 24-hour day.

Finally, if you're just out in space with nothing big around to put a shadow between you and the nearest light source, there's no day or night.

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14y ago

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