The future of the planet may not be the most comfortable of subjects to think about — from the threat of climate change to worry about world wars — but for astronomers, it’s something to consider when looking at distant planets outside our solar system, called exoplanets. Exoplanets can be quite different from Earth, with different sizes, densities, and orbits from their stars. Nevertheless, occasionally researchers find an exoplanet which is similar to Earth and which gives a sneak peak
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