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.
Venus is the answer to âwhat is the closest planet to Earthâ. It is similar in diameter, mass, and volume, but you can see how it is a scary world compared to ours. There are several missions headed to Venus.nly the Sun and the Moon are brighter. When Venus is closest to Earth it is only 38 million km away. When Venus and Earth are at their closest approach to each other, it is called opposition. Incredibly, the distance between the planets can vary at different oppositions.