Interesting
Comets are small, irregularly shaped objects composed of a mixture of rocks, dust, and what astronomers refer to as “ice” -- frozen water, methane, and ammonia. Most have highly elliptical orbits that bring them close to the Sun and then swing them deep into space, often beyond the orbit of Pluto.
When a comet is far from the Sun, it is frozen solid into a tiny nucleus. But comets put on a spectacular show when they visit the inner solar system. As a comet gets closer to the Sun, the surface of its nucleus warms. Icy materials begin to sublime into gas. As the gas boils off the comet, it can take small particles of dust with it. The gas and dust forms a cloud of diffuse material, called a coma, that surrounds the nucleus. The coma can swell to many times the size of the nucleus. If the comet gets close enough to the Sun, the solar wind can blow gas and dust away from the comet, forming elongated and often multiple tails of gas and dust. The tail always points away from the Sun -- not away from the comet’s direction of motion.
From rain-forest treasure to luscious treat—immerse yourself in the story of chocolate.
A gift for the gods. A symbol of wealth and luxury. An economic livelihood. Bonbons. Hot fudge. Candy bars. For thousands of years humans have been fascinated with the delicious phenomenon that we call “chocolate.”
In classical physics the future is just a half of the time-line. In special relativity the future is considered as absolute future or the future light cone. In physics, time is considered to be a fourth dimension. Physicists argue that space-time can be understood as a sort of stretchy fabric that can bend due to forces such as gravity. While a person can move backwards or forwards in the three spatial dimensions, many physicists argue you are only able to move forward in time.
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