A supernova is the violent, destructive explosion that marks the death of a massive star. Here's a possible recipe for the molecules of life that requires NO sunlight ... Volcanic vents, thousands of feet below the surface, right here on Earth...So that means when these meteorites were forming from a gas cloud during the birth of our solar system, the gas cloud had been sprinkled with iron 60 from an exploding supernova. A supernova is one of the most powerful explosions in the universe. And just maybe on places like Jupiter's moon, Europa.Over many, many years they smashed together to make fewer, bigger planets. In this case, I know the ingredients: flour, eggs, milk, water, butter. So I might just try mixing all these things together and baking them. David Reed is now the world's foremost expert on the evolution of lice. of, not only the head louse, but also of this little guy: pediculus humanus humanus, the body or clothing louse.And those smashed together to form fewer, even bigger planets. I could try different orders, different combinations, different amounts, but what you get is not pí¢te í choux. He thinks the pests can solve all kinds of mysteries about our past, like when we started wearing clothes. To the naked eye it looks identical to the head louse, but there are a few key differences: it lives and lays its eggs only in clothes and bedding, and, unlike the head louse, the clothing louse can kill you.
Hi, I'm Neil de Grasse Tyson, your host of NOVA science NOW, where this season we're asking six big questions. The Sun; the planets; our home, the Earth: what triggered their creation? But lately, we've found some intriguing new evidence that tells us our peaceful solar system might have started with a violent event. One trait stands out in nearly all meteorites: metal; they've got it. This meteorite hunting is a lot harder than it looks, and some days, you don't find any. Luckily, over the years, hunters have turned up more than 30 thousands specimens.Where did the very first living thing on Earth come from? One team may have retraced a key step in the birth of life, itself. But where did this stable piece of real estate come from?Scientists have long argued that billions of years ago, life emerged on its own—but no one knows exactly how. We know that stars and planets, once upon a time, all started out like this, with enormous clouds of gas and dust. Some leave deep impacts in Earth, like one that blasted Arizona's Barringer Crater, 50,000 years ago. They can be as small as dice, reduced to a rocky cinder.That number, 60, tells you how many protons and neutrons are in an atom's nucleus, so when this rock formed, four-and-a-half billion years ago, it was originally infused with iron 60. They're used to help build the proteins that make up the cells in our bodies: skin, hair, brain cells, the heart. They've given us a glimpse of where we come from...And iron 60 is created in only one place: a supernova. John Sutherland's recipe for life required sunlight. Cook at 212-320°F Where in the world do you find a kitchen like that?
Until one day, only a few really big ones remained... One of the most significant events in our distant past is still perhaps the greatest mystery: the origins of life itself. If you look down the evolutionary tree of life, you'll see that we mammals branched from reptiles, which branched from fish, and so on and so on, all the way down to the base of the tree, a common ancestor, some single-celled organism, billions of years ago. And where did the very first living thing come from? In the kitchen, we bring together different ingredients all the time to make all kinds of different things. He is bringing me to a local strip mall, in Florida, to see if I've got what it takes to be a professional nitpicker. ..it carries three deadly diseases that have killed millions of humans over recent history.