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1-23 of 23
- Travel through time, look at the most dramatic eruptions in history and on different continents. Experience a journey deep inside volcanoes. An instructional documentary about how different types of volcanoes are created and where they are or were located, what they have done and what they might do when and if they erupt. The details of the type of volcano one is and the devastation it caused when it did erupt.
- The unique features of Earth's moon and the processes that shaped it are described. Past theories of the Moon's formation are also presented.
- A few of the astronomical mysteries that bother scientists and the progress toward understanding them are described.
- Many considerations come to the forefront when planning space travel beyond the moon. Scientists are currently working on overcoming the many challenges and testing their solutions.
- Black holes, white holes and worm holes are all consistent with Einstein's theory of General Relativity. Of the three, actual evidence exists only for black holes. Their behavior is explained. Scientists speculate on on whether white holes and worm holes exist and how they would behave.
- Scientists speculate on how life originated on earth based on the range of conditions where life survives today and the conditions that existed on the early earth. They then look for those conditions, past or present, that may exist on other planets or moons.
- The many and various hazards to space travel are explained. But solving that problem better propulsion systems are need to travel anywhere beyond the moon. Some possibilities, both realistic and speculative, are described.
- Although supernovas are associated with the death of stars they also seed the universe with heavy elements that comprise rocky planets like Earth and living creatures. Due to their extraordinary brightness supernovas have a recorded history dating back 2,000 years. Although closely studied for decades their infrequency has permitted only a general understanding of their behavior until very recently. New computer models can model the major details of the explosion while new exploratory techniques reveal many more events including some truly super supernovas.
- Program presents scientists current understanding of gravity and some of the phenomenon it causes.
- They are the crown jewels of the galaxy. Neither stars, planets, moons or asteroids, they are the mysterious clouds of gas we call NEBULAS. Nearly invisible to the naked eye, astronomers use the most sophisticated techniques to tease images of these fascinating phenomena from the dark sky. When revealed in their full glory, they glow, reflect or obscure the galaxy's light.
- Program examines the possible ways the universe could come to an end. The most likely scenario, eternal expansion, is expected to be rather eventful in the long term.
- In space travel there is a saying that the first 50 miles and the last 50 miles are the most dangerous. Explore the controlled explosion of launch, the fiery crucible of reentry and everything in between. See how a single spark inside a spacecraft or a micrometeoroid less than an inch wide hitting a space station can turn a routine mission into a lethal nightmare.
- Physical behavior that results from having a constant speed of light are described.
- Some of the world's leading physicists believe they have found startling new evidence showing the existence of universes other than our own. One possibility is that the universe is so vast that an exact replica of our Solar System, our planet and ourselves exists many times over. These Doppelganger Universes exist within our own Universe; in what scientist now call "The Multiverse.
- The challenges and risks of procreation in space are examined.
- Practical applications and emerging difficulties of earth orbit are described.
- Scientists speculate on what higher life forms might look like on planets with environments different from earth.
- Could we be unique in the universe or is there another planet similar to earth somewhere in the cosmos? Is it possible that Alpha Centauri, our nearest star, is home to another earth-like planet? Earth sized planets have been hard to find, but indirect methods are coming on line to give scientists a good survey of how many such bodies may be in the universe.
- It sounds like a Hollywood blockbuster: a deadly asteroid is on a collision course with Earth. But in reality, it's only a matter of time before a giant space rock threatens to wipe out civilization. An asteroid took out the dinosaurs sixty-five million years ago. Are we next? This episode analyzes the threat and explores the many ways--from a nuclear bomb to ingenious new technology
- A variety of cosmic events have both helpful and harmful effects on life on Earth. From the beauty of the Aurora Borealis and rainbows to the dangers of UV radiation and cosmic rays, from the miracle of photosynthesis to the thrill of a meteor shower.
- Every year, thousands of objects both natural and manmade plummet through our atmosphere and crash into the Earth. These menacing messengers from the sky provide scientists with amazing insights into the natural, and not so natural, phenomena.
- For most, it's the deadly centerpiece of the film Star Wars. But in truth, real death stars are in the final stage of life before they explode into supernovae and, occasionally, the biggest blast in the universe--the gamma ray burst (GRB).
- This program traces the history of the discoveries of planetary rings. The composition and the physics of the formation and stabilization of rings are explained.