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Planets and exoplanets
The solar system and the thousands of planets found around other stars: how they form, how they are discovered, and what makes a world a planet, a dwarf planet or a candidate for life.
25 Aug 2026
What the James Webb Space Telescope has found so far
Four years of Webb results in one place: record galaxies, little red dots, exoplanet atmospheres, a neutron star in Supernova 1987A and what is still open.
21 Jul 2026
How astronomers find planets around other stars
Two main methods, transits and radial velocity, have found most known exoplanets. New missions will measure smaller planets and their atmospheres.
16 Jul 2026
Why Pluto is a dwarf planet
Pluto was reclassified in 2006 after astronomers defined planets by orbit clearing. Eris helped force the question, and New Horizons added new details.
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