You'll be able to walk around on the surface, with the star directly overhead.
Standing on the inside surface of the ring, you will feel centripetal force which will feel the same as the force of gravity. The surface of the ring will be about the same distance from the star as we are from the Sun, so it will receive about the same amount of heat as the Earth does from the Sun.
Position it so that there is a star in the centre - a star similar to our Sun will do. It will have a radius of about 95 million miles (153 million km). Make the strip about 1 million miles (1.6 million km) wide 1.īend it round into a circle so that it forms the shape of a wedding ring. Make it about 600 million miles (960 million km) long - that's a little more than the distance from the Sun to Jupiter. The concept of a Ringworld was subsequently used by other authors, in modified versions such as the small rings in the X-Box game Halo, or the orbitals of Iain M Banks. Originally described in Larry Niven's book of the same name, Ringworld, it also appeared in three sequels, The Ringworld Engineers, The Ringworld Throne, and Ringworld's Children. Make sure to comment on why we don't need to take centripetal force into account.The Ringworld is a science fiction construct - a huge world created in the shape of a ring. (c) Next, calculate your centripetal acceleration because of the rotation of Earth and compare this value to the gravitational acceleration of Earth. first calculate how fast you are moving as the Earth spins. Shouldn't we be taking centripetal force ideas into account when we do the summation of forces on, let's say, you standing on the ground? Let's see. (a) How fast would the ring have to spin in order for your measured "weight" to be the same as it is on Earth? (b) On the Earth you are also moving in a big circle as the planet spins. People inhabit the inside of the ring which is spun to simulate gravity. The 186 million mile diameter ring surrounds a star for light and energy. In the Hugo Award winning novel, Ringworld by Larry Niven, aliens build a massive ring in space for "people" to live on.
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