Tom Metcalfe

Nabta Playa in Egypt is an ancient stone circle that researchers suspect was used to determine the summer solstice, which signaled rain was on the way.

The construction of the monument and another beside it more than 4,000 years ago corresponds to a time of bitter cold.

Archaeologists in China have unearthed a mysterious set of rectangular wooden pieces linked to an ancient astronomical calendar.

Satellite photos showing poop stains in the West Antarctic snow and ice have revealed a previously unknown breeding colony of emperor penguins.

An uneven distribution of stars in several nearby clusters may offer evidence of MOND — a controversial theory of gravity that disputes Newton and rejects the existence of dark matter.

A manuscript attributed to Galileo Galilei found to be a forgery in August has led to the discovery that a different, controversial book was authored by the celebrated Italian astronomer.

Neolithic people sprinkled the crystals over burials.

Millions of tons of a type of extremely reactive chemical can form in the atmosphere each year, with implications for health and the global climate.

Future fusion reactions inside tokamaks could shine even brighter than before, thanks to groundbreaking new research to find the maximum density of the hydrogen plasma fuel that powers them.

Two new sunspots have ended a long period of relative quiet on the surface of our blazing host star, heralding the start of a new 11-year cycle of sunspot activity.

Two immense swarms of sunspots have popped into view on the surface of the sun, hinting at the increased possibilities of vivid auroras and potentially damaging solar flares over the months to come.

The internet erupted after a photograph from the Mars Curiosity rover appeared to show an "alien door," experts are pretty sure it's just a natural feature.

Russia claims to have used its Kinzhal hypersonic missiles for the first time, in its invasion of Ukraine. Here's why these super-fast weapons are so concerning.

The green energy revolution is getting closer.

The secret behind a record-breaking nuclear fusion experiment that spit out 10 quadrillion watts of power in a split second has been revealed.

A telescope in Arizona modified to measure the true distance of galaxies has produced the largest three-dimensional map of the universe ever.

The remains of a V2 rocket fired by Nazi Germany at London during World War II have been unearthed in a field in the southeast of England, where it crashed and exploded before reaching its target.

Smoke from massive wildfires in Russia's eastern Siberia region has reached the geographic North Pole "for the first time in recorded history," according to NASA.

Iceland may be the last exposed remnant of a nearly Texas-size continent — called Icelandia — that sank beneath the North Atlantic Ocean about 10 million years ago

Evidence of collisions between black holes and neutron stars suggests dark matter might consist of concentrations of primordial black holes.

Scientists are finally figuring out how much dark matter — the almost imperceptible material said to tug on everything, yet emit no light — really weighs.

Rare mounds of a crystalline mineral have emerged above the surface of Utah's Great Salt Lake, where they're expected to remain just a few months before disappearing again.

Scientists are scouring the remote Antarctic ice cap for rare meteorites chock-full of iron and holding secrets to the history of our solar system going back some 4.5 billion years.