标签：地平线 相关文章
Our second suspects, pesticides, are the most controversial. This year the European commission analyzed the two-year-ban on the use of called Neony Cortenoise. They said the evidence now showed that they were in unacceptable danger to bees feeding on
探索与发现2013年
As the bee is trying to find her way home, she is tracked by the radar. She flies on auto pilot 500 meters northwest. She gets to where she thinks the hives should be, but of course it's not there, she has to use a different navigation system to find
探索与发现2013年
Lin has recently become R* spokesperson in the neonicotinoid debate.-The big advantage of neonicotinoids is that you can plant the seed already treated. It means the farmer doesn't have to spray. If you've got to spray, it's very expensive. It's got
探索与发现2014年
This is good honey. It's very good honey. Yeah, it's very good honey. And this is the honey from the Refuday Tegmoden. Tegmoden,... is not very far, is it? Emnh, now the distance between the hive that produce this and the hive that produce that, how
探索与发现2014年
So more than a third of different kinds of bees that once lived in this woodland have now disappeared. What's intriguing here is that their immediate habitat has barely changed.-But what do you think is causing that? If their habitat here is friendly
探索与发现2014年
How Far Away Is The Horizon? 地平线有多远？ Heres a neat question you may have never thought to ask. How far away is the horizon? 你可能从未思考过这个简单的问题，地平线有多远？ Flat Earth 地球是平的 Think about it.
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At last, astronomers had a map of our galaxy. A panorama of the Milky Way, it would never be possible to see from Planet Earth. 27,000 light-years from our solar system is the centre of our galaxy. If we were ever going to have a chance of seeing a b
探索与发现2013年
But if you look carefully, stars aren't spread smoothly across the whole sky. They are gathered together into a band that loops around the sky which we call the Milky Way. That bright strip across the sky with its extraordinary abundance of stars and
探索与发现2013年
But if watching matter tumble over the edge of a black hole might now be possible, it is only because of the efforts of a generation of astronomers to wrestle these dark dragons of the cosmos into the realms of scientific reality. As is often the cas
探索与发现2013年
Theres nothing anywhere near as extreme as a black hole. The disturbing truth about black holes is that there are boundary between the known universe and the place that would forever lie beyond the reach of science. They are in an anomaly of gravity
探索与发现2013年
High above your head, in the centre of our Milky Way Galaxy, a violent drama is about to unfold. Our super-massive black hole is getting ready to have dinner. As a gas cloud three times the size of the Earth, its caught in its gravitational hold. Acr
探索与发现2013年
Nothing is more seductive than the unknown, nothing more compelling than a place of danger that lies beyond normal comprehension. Of all those places, perhaps the strangest of all are black holes. They are an exit point from the Universe, hidden trap
探索与发现2013年
The X-ray image revealed how the black hole at the heart of the galaxy was firing unimaginable amounts of radiation into surrounding space and with extraordinary consequences. We could see what was going on at the centre and we could start to underst
探索与发现2013年
The super bright quasar phase having ended many billions of years ago, when the fuel that fires violent emissions was completely consumed. But now, with the approaching gas cloud and a prospect of feeding, the black hole should get brighter. Exactly
探索与发现2013年
Far from being violentaions and destruction, it seems instead , black holes might actually be benign architects ,whichve played a part in the creation of the galaxies,stars,and even the life itself. One of the first scientists to begin to see black h
探索与发现2013年
Was there any connection between the two? What Magorian discovered was completed unexpected. The relationship that we find was essentially that the bigger the galaxy, the bigger the black hole. That's in its broad terms. If you want to be a bit more
探索与发现2013年
There was now a pressing challenge to understand how black holes in their surrounding galaxies. To be so intertwined.，professor Andy Fabian in the Cambridge University is one astronomer who began to look. Like the ripples, they travel out from his
探索与发现2013年
If you look at the Milky Way galaxy, its this interesting balancepoint that this place where its just enough to wash from the black whole tokeep things interesting to possibly make the environment that allows us toexist here. Astronomers are eagerly
探索与发现2013年
Just as I arrived at UCLA with my first faculty position, everything was falling into place in terms of the ability to answer this question at the centre of our galaxy. The telescopes were getting bigger so you had the due ability to see fine details
探索与发现2013年
Instead, it seems to be a gas cloud moving at huge speeds right in the direction of the black hole. But what really rang along bells was the way it had changed shape. We see that this gas cloud as it moves closer and closer to the black hole, is gett
探索与发现2013年