One Universe at a Time

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Invariable Plane

One aspect of our solar system is that it is essentially a closed system. The stars are so widely separated that it would be rare for a stray asteroid or other object from beyond the Oort cloud to enter our solar system. This means that nearly all the rocky material orbiting the Sun now was also part of the solar system billions of years ago. This has a few consequences, one of which is the tendency for the solar system to lie in a plane.

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Our Universe

If you are fortunate, you have come across a book or two that has deeply impacted your life. One such book for me is by Roy A. Gallant: The National Geographic Picture Atlas of Our Universe.

Credit: G.L. Le Sage 0

Gravity’s Shadow

In 1748 Georges-Louis Le Sage proposed a solution to gravity. He argued that gravity wasn’t due to a mutual attraction between masses, but rather due to the interactions of particles moving through space. This idea came to be known as shadow gravity.

Credit: Jean Leon Huens 0

Fiat Lux

In 1671, Isaac Newton submitted a letter to the the Royal Society outlining a new theory of light and color. While Newton is probably most famous for his theory of gravity—and the mythical apple—he was also deeply interested in the nature of light, and made one of the first detailed studies of the properties of light. The work he describes in this 1671 paper is so brilliantly simple you can do it at home. All you need is some sunlight and a couple of prisms.

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