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.
Mercury. 1  Mercury is the closest planet to the Sun, just 58 million km (36 million miles) or 0.39 AU out, but it is not the hottest planet. 2  Mercury is the smallest planet in our Solar System, and is just slightly larger than the Earthâs moon, and equivalent in size to 0.38 Earths. 3  Diameter: 4,879 km (3,032 miles).