CHRIS BUTLER / SCIENCE PHOTO LIBRARY CHRIS BUTLER / SCIENCE PHOTO LIBRARY
Sigma Draconis planet. Computer artwork of the surface of a hypothetical planet orbiting the star Sigma Draconis (lower left). This star is an orange dwarf that lies just under 19 light years from Earth in the constellation Draco. Two moons of this planet are seen in the sky, at centre right and centre left.
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