Symptoms of Age-Related Macular Degeneration (AMD) An early symptom of wet AMD is that straight lines appear wavy. An Amsler Grid chart can help spot this early distortion of vision. You may also notice a small blind spot, resulting in a loss of central vision.
Traveling at approximately 29,000 km/h (18,000 mph) the shuttle orbits Earth every 90 minutes. By using current technology and a spacecraft powered by chemical rocket engines, a trip to Mars could take between six to nine months.
I have heard that the International Space Station is moving at 17,000 mph. 1. How is it moving that fast when our aircraft here on earth only move 1600 mph or so? (I assume something to do with less gravity in space but can you explain it?) 2.