![]() ![]() If an atom enters its ground state from a more excited state, it typically gives off a photon of light in the process. An atom is in a ground state when it is at its lowest possible energy as defined by the orbits of its electrons. This causes the molecules to collapse to a ground state. "Air glow is everywhere around on Earth and, and the molecules in the upper atmosphere get excited from solar activity." "Auroras are excited by electrons, and other solar particles coming down Earth's magnetic fields, which is why you see them in the polar regions," Pettit said. However, airglows and auroras are separate phenomena, driven by different processes. This is a phenomenon called airglow, and it can be similar in color to the shimmering night-sky lights known as the auroras-the Northern and Southern Lights. Another photo of the International Space Station shared by Oleg Novitsky on Twitter on Sept. One notable feature of the image is the green glow that separates the Earth from space. "The stars don't twinkle because the twinkling is an atmospheric phenomena, and the stars are brighter than what you're used to, and they're more colorful," Pettit said. Of that, there are around 30 minutes in which the ISS is in the shadow of our planet, free from the sun's glare. The ISS orbits the Earth once every 90 minutes. One limiting factor is that the conditions aren't always right for a photo. If I could do a couple hours' of photography a day, that would be a real treat." And then you can spend that time doing photography. "Outside of your normal working hours, you can do whatever you want to, which includes sleeping and eating and staying in touch with your family. "We work 12- to 14-hour days six days a week on station, and outside of that you are off duty," he said. ![]()
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