Eyeglasses made of nylon were introduced in the late 1940s. Because of brittleness and other problems, eyeglass manufacturers switched to blended nylon (polyamides, co-polyamides and gliamides). Today's blended nylon frames are both strong and lightweight.
Venus is the closest size to Earth and is sometimes called Earth's sister planet.. Its diameter is 95% of Earth's but its mass is only 81% as much.
1 Venus is the 2nd planet from the sun. 2  The closest planet to the sun is Mercury. 3  Then comes Venus and then Earth, followed by Mars, Saturn, Jupiter, Uranus, Neptune and Pluto. 4  There are other orbiting bodies beyond Pluto but astronomers (scientists who study the Solar System) do not agree about whether these are planets. Venus is the planet which is closest to the Earth and is a little smaller than the Earth. 2  The diameter of the Earth (the distance right round the middle of the Earth at the equator) is 12,760 kilometres, or 7926 miles.