If you’re dreaming of a tropical family vacation, Hawaii is as deliciously looking as the ripest pineapple on the tree — it’s sweet, sunny, and with just enough tang to keep everyone on their toes.

If paradise had a “plus-size” option, the Big Island of Hawaii would be it. Twice the size of all the other Hawaiian Islands ...

Scientists explored several lava tubes in Vietnam and found some “bent-toed” creatures in the caves in a first-of-its-kind sighting, photos show. Photo from Nguyen, Tran, Nguyen, Hoang and Nguyen ...

Venus is often called Earth's "sister planet" because of their similarities in size, mass, and composition. Both are rocky worlds that formed about the same time in the inner solar system; however, ...

Scores of rescue tubes have been placed at beaches across Maui to assist in volunteer rescues. Several years ago, Kelsey Marks, a visitor on Maui, used a rescue tube to save two people in separate ...

We’ve known for quite some time that molten rock gouged enormous tunnels into the surface of the Earth, the Moon, and Mars. In fact, scientists have proposed that the vast lava tubes under the surface ...

The takeaway: Little is understood about the geology of Venus, and recent findings suggest that the planet's subsurface processes may not follow the same patterns observed elsewhere. Future missions ...

We now know for sure that massive underground tunnels, carved by lava, exist on Venus – and they are surprisingly wide and different from those on any other planet. It is uncontroversial that lava ...

Astronauts train to scale a Mars volcano at an analogue site in France. Lava tubes that crisscross the Martian surface might provide sanctuaries for the first human explorers on the Red Planet. (Photo ...

This lava tube is reportedly the third-longest in all of North America, trailing Hawaii’s 40-mile Kazumura Cave and the less-publicized 9-mile Deadhorse Cave system near Washington’s Mount Adams.

Why it's incredible: The cave was created by lava from Mount Fuji and now holds giant ice pillars. The Narusawa Ice Cave is a lava tube that is brimming with icicles and ice pillars at the base of ...

A Connecticut man is likely breathing a sigh of relief thanks to a team of firefighters and other emergency personnel who rescued him after he became stuck inside a tube slide at a children's ...