For over half-a-century, the Nasa and US Geological Survey's Landsat program has documented changes to the Earth's surface, making it the longest continuous space-based record of our planet's land ...

Photograph by Garcia Julien, Getty Images We also enjoy protection from Earth's magnetic field, generated by our planet's rotation and its iron-nickel core. This teardrop-shaped field shields ...

By the time the second image was captured in 2019, the ice covered less than 0.4 square miles (1 square km), according to NASA's Earth Observatory. The glacier was declared dead in 2014 ...