A mystery interstellar object discovered by a British astronomer is most likely the oldest comet ever seen. The "water ...

The catastrophic event, which occurred 252 million years ago, wiped out nearly 90 per cent of all life on Earth, both on land and in the oceans.

In September 2023, a global seismic mystery began to unfold. Every 90 seconds, the Earth pulsed with a strange, low-frequency ...

Around 20,000 readers voted in the 2025 Telegraph Travel Awards. Here we reveal your top (and least favourite) countries ...

Researchers have uncovered that both ocean currents and atmospheric changes contribute equally to a cold patch in the North Atlantic. While global temperatures continue to rise, one area in the ...

AN INTERSTELLAR space rock zooming through our solar system may be the oldest comet ever seen by humans, according to ...

Comet 3I/Atlas may be the oldest spotted so far and should be visible through amateur telescopes in just a few weeks' time.

A mass extinction event wiped out around 90% of life. What followed has long puzzled scientists: The planet became lethally ...

A physicist solves an old thermodynamic puzzle and demonstrates directly from the second law that entropy disappears at ...

Understanding how wildfires influence our planet's climate is a daunting challenge. Although fire occurs nearly everywhere on ...

Scientists agreed the rocky outcrops in a remote part of Quebec, Canada, were ancient. But were they really Earth’s oldest?