Impacts from space have created our planet and just about everything in it. Like celestial supply ships, they brought in water, metal, and maybe even life. They made our moon and sculpted the geography of our planet.
Following 161 84 views About Export Add to From the Great Pyramid at Giza to the towering skyscrapers of today, humans have engineered massive constructions for at least 5,000 years. But why? How do biology and human emotions affect our desire to build gigantic structures?
2013 • Nature
The trek from earth to Mars is fraught with difficulties, from surviving radiation en route to landing in a space craft not yet designed. Mars One founder Bas Lansdorp attends the Mars Society Convention in Washington, DC, to debate the risks and rewards with scientists from around the world.
Today we are talking about the life -- and death -- of stars. Low mass stars live a long time, fusing all their hydrogen into helium over a trillion years. More massive stars like the Sun live shorter lives. They fuse hydrogen into helium, and eventually helium into carbon (and also some oxygen and neon). When this happens they expand, get brighter, and cool off, becoming red giants. They lose most of their mass, exposing their cores, and then cool off over many billions of years.
They are NASA’s first family – the wildly popular rovers. Follow the ongoing adventures of Curiosity and flash back to its precursors – twins Spirit and Opportunity, and little Sojourner - as they lift the veil on the mysteries of the Red Planet.