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What is antumbra?
The antumbra is the region of a shadow that is partially shaded and partially illuminated by a light source, such as during a solar eclipse when the moon does not entirely cover the sun. It is the area where the light source is not completely blocked, creating a dimmer shadow than the umbra.
What is the difference between luminous flux and lumens, and how do they affect the brightness of a light source?
Luminous flux is the total amount of light emitted by a source in all directions, while lumens measure the amount of light that is actually perceived by the human eye. The higher the luminous flux or lumens, the brighter the light source will appear to us.
How many light years is Callisto from the sun?
Callisto, one of Jupiter's moons, is about 481 million miles away from the sun. In terms of light-years, it is roughly 0.000005 light-years from the sun.
How far does the sun's gravity reach?
In physical terms - to the ends of the Universe. In practical terms - to the edge, where something more massive has a greater influence. In "our" terms, about 2 light years from the Sun (But all depends in which direction you are looking (thinking).
How old will you be when you get to the sun in light years?
I will not be able to reach the sun in terms of light years as it is within our own solar system. However, light from the sun takes about 8 minutes to reach Earth so you could say it would take about 8 minutes in terms of light years to "reach" the sun.
