说明:
Rogue planets, fossilised stars, black holes more massive than a million Suns. Huge advances in our understanding of the Universe mean that for the first time the BBC can take you to places we didn’t even know existed just ten years ago.
Across five episodes, Professor Brian Cox roams the vastness of space and time uncovering exquisite moments of sheer drama that changed the Universe forever. Watch the birth of a star in a stellar nursery, experience the power of a supermassive black hole as it consumes an entire planet, and witness the chaos created as another galaxy collides with our own galaxy, The Milky Way.
Season 1 - Episode 2 - Alien Worlds: The Search for Second Earth
Humans have long gazed up at the night sky, wondering whether other lifeforms and intelligences could be thriving on worlds far beyond our own.
Answering that question seemed fated to remain pure speculation. But over the last few decades, ultra-sensitive telescopes and dogged detective work have transformed alien planet-hunting from science-fiction into hard fact. Gone are the days of speculation; the hunt for extra-terrestrials has become a matter of serious scientific inquiry.
As the hunt for alien worlds began, we expected to find worlds similar to the planets in our own solar system, but we instead discovered a riot of exotic worlds. Vivid animation based on data from the most successful planet hunter of them all, the Kepler space telescope, brings these worlds into view: puffy planets with the density of polystyrene, unstable worlds orbiting two suns and thousand-degree, broiling gas giants with skies whipped into titanic winds.
But perhaps the most startling discovery was the number of worlds that may be contenders for a second Earth. Our latest survey of the galaxy estimates that there are billions of rocky planets at the right distance from their sun to have that ingredient so crucial for life as we know it, liquid water. Amongst them, we witness the most tantalizing discovery of all: a so-called ‘super-Earth’, situated in the Goldilocks zone - the area just the right distance from a sun to potentially support life - and with the faint signal of water in its atmosphere.
With over 2,800 exoplanets confirmed by Kepler and discoveries still rolling in, Brian lays out his own answer to the age-old question with thrilling new science: Are we alone?
Please do not tag or rehash this release as all that achieves is to dilute the file spread. Feel free to post this release elsewhere but please leave it as it is.
Thank you,
skorpion.
 |
-