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 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.ars. 1  Distance from Sun: Mars is the fourth planet from the sun at a distance of about 228 million km (142 million miles) or 1.52 AU. 2  Diameter: 6,787 km, (4,217 miles). 3  Length of Year (Orbit): 687 Earth days. 4  Length of day: 24 hours 37 minutes.