Dr Tim Gregory

Dr Tim Gregory is a planetary geologist. His cosmochemistry research focuses on the geology of the early Solar System. After completing his PhD at the University of Bristol in 2019, he took up a research scientist post at the British Geological Survey in Nottingham.

Cosmochemistry combines two of his great loves in life: rocks and space. He researches the timing of events during the formation of our Solar System over 4.5 billion years ago by studying the oldest rocks we know of — meteorites.

Tim surpassed thousands of applicants for a place in the six-part BBC2 series Astronauts: Do You Have What It Takes?, where he was put through the full rigours of astronaut selection and reached the final three.

Since then, he has gone on to present a segment about meteorites on BBC4’s The Sky at Night and has made live television appearances on BBC Breakfast, BBC Look North, and BBC Points West. He has a monthly spot on BBC Radio Bristol to talk about space exploration and regularly features on local and national radio to talk about events in the world of space science.

Tim loves nothing more than sharing his love of science and the wonders of the natural world. He regularly speaks to audiences of all sizes and ages on topics such as cosmochemistry, planetary science, and the importance of science in society. His enthusiasm is infectious and his deep knowledge of planetary science shines through.

Originally from West Yorkshire (and with the accent to prove it), Tim completed his undergraduate degree at the University of Manchester where he achieved a first class with honours in Geology with Planetary Science (MEarthSci). He discovered his love for cosmochemistry during a ten-week internship at NASA’s Johnson Space Center in Houston, where he investigated the history of water-rich asteroids.


Meteorite: The Stones from Outer Space that Made our World

Dr Tim Gregory

Meteorite: The Stones from Outer Space that Made our World, is an exhilarating journey into the past, present and future of our planet. In this book, Tim uses fragments of rock to give an insight not only into the Earth’s earliest origins, but also its possible future.

Every rock has a story tell, and none more so than those which have fallen from the sky: meteorites. Originating in the Asteroid Belt between Mars and Jupiter, these rocky fragments offer clues not just to the earliest origins of the Solar System but also to Earth’s very survival into the future.

Meteorite takes us on a journey through the very earliest days of our Solar System, to the spectacular meteorite falls that produced ‘fiery rain’ in 1792, to the pre-solar grains (literally stardust) that were blown in from other solar systems and are the oldest solid objects ever discovered on earth.

Meteorites reveal a story much bigger than ourselves or our planet. As Tim says, ‘it is an epic beyond compare’.

Tim Gregory gets it… he brings a childlike wonder of discovery to everything he sees… His scientific delight is contagious.

— Chris Hadfield, Astronaut

A captivating blend of painstaking detective work and dramatic cosmic events. The impact that rocks from space have had on our culture, and on our knowledge of where we come from may surprise you.

— Jon Butterworth, Professor of Physics at UCL and author of Smashing Physics