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a billion is a million of a million like this 1.000.000.000.000. But as governments whant to keep ignorant the people they accept the thousand or a million as a billion but the difference is huge like this. 1.000.000.000.000 a billion and 1.000.000.000 a thousand of a million. there is a gigantic difference. A trillion is 1.000.000.000.000.000.000
Nadia - Exactly. Replacing aged cells is one way to ensure that there is a constant replenishment of old or dysfunctional cells with young healthy cells so they can continue to perform cellular functions properly.
Matt - Right. Exactly. The earth is about four and a half billion years old. And so in the past, the earth was spinning a lot quicker than it is now. You wouldn't have to go back in time much more than a billion years or so to have days less than 20 hours long. So yes, it's the shortest day for the last couple of hundred years maybe.
Over geological time, over millions of years they'll be preserved in a rock stratum in just the same way that dinosaurs are preserved in rock strata from 65 million years ago. When we consider that the oldest fossils we have on Earth are 3 and a half billion year-old single-celled microscopic, soft-bodied bacteria.
Occasionally one of them's going to cross the orbit of another planet, get drawn in by gravity and crash land. Most of the water on Earth, we think, comes from comets, originally. Given that they're not actually that common these days but over the millions of years time scale I'd say the amount of water on Earth hasn't changed a huge amount.
It's almost counterintuitive, right? You would think ‘big star, more fuel, it would last longer’. But big stars really do sort of live fast and die young. They burn so hot, they burn through their fuel much, much more quickly than smaller stars. So a star like the sun, which is pretty small, would last about 10 billion years.
It’s possible that life started more than once but was then obliterated and had to start over again. So we could have had life older than 4 billion years ago but no traces of that survive. Georgia - We were back in time when we know the oldest life was starting to appear - 3.8 billion years ago.
Each lightning flash is about 3 miles long but only about a centimetre wide. It discharges about 1-10 billion joules of energy and produces a current of some 30,000 - 50,000 amps, which heats the surrounding air to over 20,000 degrees Celsius, three times hotter than the surface of the sun (6000 degrees Celsius).
Owen - Not my favourite rock but it is the world’s oldest rock. This is dated at 4.03 billion years ago and, to put that age into context, as I said before, the Earth is 4.56 billion years ago, so it’s the oldest rock. To date this rock we need to do some form of radiometric dating.
The Earth's core is basically molten and the Earth is in the region of four billion or so years old. How come it hasn't cooled down over the last four and a half billion years, and why hasn't man tried to tap into all that energy?