The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball ...

Our first stop gets pretty hot. At 7 million to 10 million kilometers above the sun's surface, we reach the corona, the outermost layer of the sun. It blazes at 1 million degrees Celsius ...

Scientists have always been curious about the atmosphere surrounding us, but in the past, they could not just hop on a spaceship to see what was up there. Instead, scientists hiked up high ...

We know that the sun’s atmosphere is much hotter than its outer plasma layer, a fact that seems to defy thermodynamics. Solar wind from the corona drifts outward, crossing 93 million miles of ...

with its four science instruments programmed to collect science data about solar wind from inside the sun's corona — the outermost layer of its atmosphere. On Tuesday (March 25), the probe ...

The ozone layer 11 to 40 kilometers above Earth’s surface filters out most of the Sun’s ultraviolet radiation, which can cause skin cancer and cataracts. From the mid-1970s, chemicals called ...