Caption: “Hello, World.” Commander Reid Wiseman, Nikon D5, mission day one. The Sun is hidden behind Earth, and the globe is lit mainly by moonlight from the nearly full Moon behind the spacecraft. Around both poles the faint green auroras are visible, where electrons guided by Earth’s magnetic field excite oxygen high in the atmosphere. Hugging the day–night boundary is a razor-thin glowing shell: the upper atmosphere seen edge-on, its airglow (including light from a narrow sodium layer around 80–100 km up) intensified into a bright band. Stretching away from Earth is a soft triangular wedge of zodiacal light, produced as sunlight scatters off interplanetary dust from comets and asteroids that orbit the Sun. Down in the lower right, we can even spot Venus, shining as a brilliant spot against the dark of space. Credit: NASA/Reid Wiseman
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