From a distance, our galaxy would look a flat spiral, some 100,000 light years across, with pockets of gas, clouds of dust, and about 400 billion stars rotating around the galaxys center. Thick dust and blinding starlight have long obscured our vision into the mysterious inner regions of the galactic center. And yet, the clues have been piling up, that something important, something strange is going on in there. Astronomers tracking stars in the center of the galaxy have found the best proof to date that black holes exist. Now, they are shooting for the first direct image of a black hole.
It’s the ultimate buddy movie. Forty years ago, on November 19, 1969, astronauts Pete Conrad and Alan Bean landed on the moon in one of the most important of the Apollo flights. This video shows them making a pinpoint landing on a treacherous lunar surface, finding rocks, and generally having a blast. The program features an interview with Pete Conrad, filmed a year before he died in a tragic motorcycle accident in 1999. Credit Space.com with editorial assistance.
Time is flying by on this busy, crowded planet as life changes and evolves from second to second. And yet the arc of human lifespan is getting longer: 65 years is the global average way up from just 20 in the Stone Age. Modern science, however, provides a humbling perspective. Our lives indeed the life span of the human species are just blips compared to the age of the universe, at 13.7 billion years and counting. It now seems that our entire universe is living on borrowed time. How long it can survive in any form depends on whether Stephen Hawking’s theory checks out.
The universe has long captivated us with its immense scales of distance and time. How far does it stretch? Where does it end and what lies beyond its star fields and streams of galaxies extending as far as telescopes can see? These questions are beginning to yield to a series of extraordinary new lines of investigation and technologies that are letting us to peer into the most distant realms of the cosmosBut also at the behavior of matter and energy on the smallest of scales. The mind-blowing answer comes from a theory describing the birth of the universe in the first instant of time.
We’ve never seen them directly, yet we know they are there, lurking within dense star clusters or wandering the dust lanes of the galaxy, where they prey on stars, or swallow planets whole. Our Milky Way may harbor millions of these black holes, the ultra dense remnants of dead stars. But now, in the universe far beyond our galaxy, there’s evidence of something even more ominous: a breed of black holes that have reached incomprehensible size and destructive power. How big can they get? What’s the largest so far detected? Where does an 18 billion solar mass black hole hide?
The final episode features the summer plankton bloom along the coast of British Columbia and Alaska. In winter, the coastal fjords and inlets are relatively lifeless, and the resident Steller sea lions must dive deeper and further from the coast to catch the widely-dispersed herring. Humpback whales overwinter in the warm Pacific waters off Hawaii, where new mothers suckle their calves. They begin their 3,000 mile journey north in early spring, when the sea lions also give birth to their young. Spring storms are a hazard for the sea lion colonies and some pups are inevitably lost, but these same storms disturb nutrients in the water which, together with the strengthening power of the sun, act as the catalysts for the plankton bloom. Huge shoals of herring arrive to spawn, turning the shallows milky white. The herring sift plankton from the water. In their wake come larger predators, including Pacific white-sided dolphins and killer whales. The latter are filmed attacking a male sea lion. Common murres dive under the herring shoals and pick off the fish from below, pinning them to the surface. Their defence is to form a bait ball, but gulls gathering on the surface attack them from above. The finale to the programme features unique underwater footage of humpbacks engulfing whole bait balls, and reveals their co-operative hunting behaviour called bubble-netting. The diary segment, “Swallowed by a Whale”, looks at the challenges of filming the humpbacks and sea lions underwater.
Some 900 million miles from the Sun in the outer regions of our Solar System orbiting the planet Saturnlies a mysterious world. Enceladus is enveloped in ice. Because nearly all of the sunlight that manages to hit its surface is reflected back into space, its one of the brightest objects in the solar system. It turns out that this distant outpost may harbor subsurface oceans and pre-conditions for life.
“if only we understood the chirps, we would be amazed”
Song Birds – part 3 of 3
“if only we understood the chirps, we would be amazed”
Documentary (2002) Nature: A detailed analysis of the reasons and ways that birds communicate. Features robins, blackbirds, finches, hummingbirds, woodpeckers, bell birds, toucans and more …
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