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About half of all stars seem to have “super-Earth” planets on orbits closer to their stars than Mercury is to the Sun, but we don’t.Illustration by Vadim Sadovski / Shutterstock Is Earth unique? Once a grand philosophical question, it has, over the past two decades, become, with the discovery of thousands of planets around other stars our cosmic cousins a scientific one. One way to address it is to imagine aliens, using present-day Earth technology, searching our solar system for exoplanets. Which of our eight planets would they find? The answer is Jupiter and only Jupiter. Our exoplanet-searching techniques look for the effect of planets on their host star, either through a cyclical gravitational tug, or by periodically blinking out some of the star’s light. Jupiter would only be detectable (for now) through a decades-long radial velocity survey of the Sun. We could measure Jupiter’s approximate mass and orbit. The question then becomes: How common, among known exoplanet

United statesWikimedia commonsNanna bachVadim sadovski shutterstockMonthly notices of the royal astronomical societyVadim sadovskiNanna bach mPlanet formationMonthly noticesRoyal astronomical societyஒன்றுபட்டது மாநிலங்களில்நன்ன பாக்மாதாந்திர அறிவிப்புகள் ஆஃப் தி அரச வானியல் சமூகம்நன்ன பாக் மீகிரகம் உருவாக்கம்மாதாந்திர அறிவிப்புகள்