Light speed
299,792 km per second, the constant c.
The amount of time it takes light or radio signals to travel a certain distance at light speed.
A light year (also spelled light-year or lightyear) is a unit of distance and is defined as the distance traveled ...
The distance that light (moving at about 186,000 miles per second) travels in one year, or about 6 trillion miles.
Large Magellanic Cloud, the larger of two small galaxies orbiting nearby our Milky Way galaxy, which are visible from the ...
A small group of about two dozen galaxies of which our own Milky Way galaxy is a member.
Local midnight typically occurs when the Sun crosses the meridian below the horizon. In areas where there is midnight Sun, ...
Time adjusted for location around the Earth or other planets in time zones.
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