They are usually found from mid-May to early June, but have been spotted as early as late April in 2026. Read more at ...

The biggest black holes in the Universe may be built through chains of violent mergers deep inside crowded star clusters.

While the USGS scientists learned plenty about volcanism in El Salvador during this trip, it also provided key insights to ...

Thor’s Well is a natural sinkhole that creates one of the most spectacular shows on Oregon’s coast. Water rushes into this ...

On view at the SWCAC museum in Shenzen, Sruli Recht’s “LAIR” took 15 years to make. Recht uses a wild range of materials, ...

From a geothermal hotspot to the one-time "Lighthouse of the Pacific," the heat is on beneath the volcanic landscape of ...

Volcano Watch is a weekly article and activity update written by U.S. Geological Survey Hawaiian Volcano Observatory ...

Mount Etna is more than half a million years old, but this massive stratovolcano in Sicily still has plenty of gas left in the tank.

At an average distance of 57,909,227 kilometres (0.4 AU), the planet Mercury is the closest planet to the sun, and also our solar system’s smallest planet. Although it is unknown who actually ...

Volcanic eruptions are significant geologic hazards. Underwater volcanoes are challenging to study, yet they play an integral role in marine geology and may cause destructive tsunamis that can ...

Lava cools very quickly at first forming a thin crust that insulates the interior of the lava flow. As a result, basaltic lava flows can form crusts that are thick enough to walk on in 10-15 minutes ...