Our interest in space and new frontiers has a long history, in this country and in others. Let's see if you can place these important events in space exploration in the correct order on the timeline. ITEM BANK: Move to Bottom First America, John Glenn, in orbitFirst American woman in spaceFirst American, Alan Shephard, into spaceFirst artificial satellite - Sputnik IFirst manned moon landingFirst occupation of space stationMars landingNASA signed into law in the USSkylab is launchedSpace shuttle launch 19551960196519701975198019851990199 52000Oct 1957Jul 1958May 1961Feb 1962Jul 1969Jun 1971May 1973Jul 1976Apr 1981Jun 1983

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light