You study the worlds of the Solar System and beyond — planets, moons, asteroids, comets, and the growing catalogue of exoplanets — to understand how they formed, how they work, and whether any of them could host life. The data come from spacecraft (orbiters, landers, rovers, sample-return missions), from telescopes, and from the laboratory analysis of meteorites and returned samples. It is the most tangible corner of astrophysics: the objects are real places with surfaces, atmospheres, weather, and geology, and a good fraction of the field looks more like geology, atmospheric science, or chemistry than like the physics of distant stars.
The work braids Discovery with Exploration in the most literal sense — you are mapping and characterising places no human has been. Much of it is patient analysis: turning rover images and spectra into a geological history, or a sequence of brightness measurements into the size and orbit of an exoplanet. The Revelation underneath is the act of reading a world's hidden past out of its present surface — a crater count that dates a terrain, a chemical signature that reveals an ancient ocean.
The exoplanet branch has exploded into one of the most active areas in all of science, and it sits at the boundary between planetary science and mainstream astrophysics: detecting planets around other stars, measuring their atmospheres, and asking which might be habitable.
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The timescales are long and tie your career to specific spacecraft. A flagship mission can take a decade or more from approval to data, which means early career choices (which mission, which instrument, which institution) shape a working life for years. Missions also get cancelled or delayed, and a team can invest years before knowing whether the data will ever arrive.
It is more interdisciplinary than its name suggests. You may need geology, chemistry, atmospheric physics, and orbital dynamics, and you will work shoulder to shoulder with engineers whose constraints (power, mass, bandwidth) directly limit what science is possible. People who want pure physics are sometimes surprised by how much earth science the field contains.
A degree in physics, astronomy, earth sciences, or a related quantitative science, then a PhD in planetary science or a closely related area; STFC funds planetary science studentships in the UK alongside the rest of astronomy [official_funder, STFC/UKRI 2025-26]. Routes increasingly run through the space agencies and the universities that partner on missions, and in Portugal through IA and the ESA membership that gives Portuguese researchers a stake in European missions [institutional, IA 2025]. Pay tracks the broader research-science scale [survey_aggregator, Prospects/PayScale 2025-26].
Image/spectral analysis ML-assisted, but work stays mission-tied and interdisciplinary; long timescales insulate the role.
Stable; AI augments analysis, human interdisciplinary judgement central.
People drawn to Planetary Scientistare often drawn to these — in the order they're closest. The ones marked sit in a different field entirely.