Using NASA's Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has discovered a new ...

There may be a warp in the Kuiper Belt, possibly caused by “Planet Y” — a Mercury-to-Earth-sized world that orbits the sun way beyond the orbit of Neptune. Is there a mysterious “Planet Y” orbiting ...

"In our solar system, the most massive moon is Ganymede, which is still extremely small compared to what we are inferring here." ...

At the beginning of the exoplanet age, the goals were fairly simple. The first was to find as many of them as possible to ...