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A Lost Habitable World. Mysteries of Venus explored.

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 A Lost Habitable World. Mysteries of Venus explored Ten Mysteries of Venus The surface of Venus is completely inhospitable for life: barren, dry, crushed under an atmosphere about 90 times the pressure of Earth’s and roasted by temperatures two times hotter than an oven. But was it always that way? Could Venus once have been a twin of Earth - a habitable world with liquid water oceans? This is one of the many mysteries associated with our shrouded sister world. 27 years have passed since NASA’s Magellan mission last orbited Venus. That was NASA’s most recent mission to Earth’s sister planet, and while we have gained significant knowledge of Venus since then, there are still numerous mysteries about the planet that remain unsolved. NASA’s  DAVINCI  (Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging) mission hopes to change that. Here are ten mysteries of Venus that NASA scientists are still grappling with:                     A Lost Habitable World. Mysteries o
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The Asteroid that Hit the Earth 66 Million Years Ago | Deep Science Documentary Tapes

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  The Impact That Wiped Out the Dinosaurs                                                   The Asteroid that hit the Earth 66 million years ago What Happened in Brief According to abundant geological evidence, an asteroid roughly 10 km (6 miles) across hit Earth about 65 million years ago. This impact made a huge explosion and a crater about 180 km (roughly 110 miles) across. Debris from the explosion was thrown into the atmosphere, severely altering the climate, and leading to the extinction of roughly 3/4 of species that existed at that time, including the dinosaurs. Many asteroids of this type are now known; their orbits pass through the inner solar system and cross Earth's orbit. Some of these could potentially hit Earth in the future. Most, but not all are smaller than the one that hit us 65 million years ago. Gaps in the Fossil Record Fossils found in soil layers of different ages show a record of slow, gradual changes in species, with simple organisms gradually being replac
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Life On Saturn’s moon Enceladus

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Life On Saturn’s moon Enceladus  Life On Saturn’s moon Enceladus. Cassini Spacecraft found oceans to similar on Earth, where life might have begun. Deep Science Documentary Tapes Aliens?! Enchiladas?! What is this world coming to? Or should I say, what is coming to this world? First of all, yes, it’s pronounced Enceladus (EN-CELL-A-DUSS), not enchiladas. Enceladus is Saturn’s sixth largest moon, but it would be better described as a winter wonderland. Winter, because it’s covered in ice and has an average surface temperature of -200º C (-330º F). Wonder, because just 40 km (25 miles) below its surface, are the ingredients for life. Are there aliens out there? How long until we know for sure? This is the Waimangu (Why-mang-goo) Geyser. It doesn’t exist anymore, but when it did, it could shoot water 460 meters (1,509 ft) high, making it the largest geyser ever known …on Earth. But beyond our atmosphere, Waimangu is a drop in the bucket. If you want to see a real geyser, you should book a
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Why Earth Have Different Types of Seasons ? | Deep Science Documentary Tapes

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Why Does Earth Have Seasons? The Short Answer :   Earth has seasons because its axis is tilted. Earth’s axis is always pointed in the same direction, so different parts of Earth get the Sun’s direct rays throughout the year. For example, in summer, the Sun's rays hit that region more directly than at any other time of the year. Many people believe that Earth is closest to the Sun in summer and farthest in winter... SAY WHAT?! Although this idea makes sense, it is  incorrect. It is true that Earth’s orbit is not a perfect circle. It is slightly elongated, so that during part of the year, Earth is closer to the Sun than at other times. However, in the Northern Hemisphere, we are having winter when Earth is closest to the Sun and summer when it is farthest away! There is a completely different reason for Earth's seasons. Earth has seasons because sometime early in its long history, something very big hit the young Earth to knock it off-kilter. So instead of rotating with its axis
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Why Same Side of the Moon Always Face The Earth ? | Explained | Deep Science Documentary Tapes

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Why Same Side of the Moon Always Face The Earth ? | Explained | Deep Science Documentary Tapes Our  lunar  companion rotates while it orbits  Earth . It's just that the amount of time it takes the  moon  to complete a revolution on its axis is the  same  it takes to circle our planet — about 27 days. As a result, the  same lunar  hemisphere  always faces Earth .   Why Same Side of the Moon Always Face The Earth ? | Explained | Deep Science Documentary Tapes Also know, why does the same side of the moon always face Earth? Only one  side of the Moon  is visible from  Earth  because the  Moon  rotates on its axis at the  same  rate that the  Moon  orbits the  Earth  – a situation known as synchronous rotation, or tidal locking. The  Moon  is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases. Furthermore, does the moon rotate around the Earth?  The  moon orbits  the  Earth  once every 27.322 days. It also takes approximately 27 days f
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Uncovering the Mysteries of Mars Habitability | Deep Science Documentary Tapes

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 Uncovering the Mysteries of Mars Habitability | Deep Science Documentary Tapes Mysteries of Mars Habitability THE HISTORY OF  MARS  IS ENSHROUDED IN MYSTERY.   why did Mars have liquid water when, by all measures, it should have been too cold, even in ancient times? “Carbon dioxide alone is not enough,   “And so that's been a problem for years: What's the extra warming agent?” That “extra warming agent” is a key to understanding the potential for life on Mars. There's not a good reason to think that it should have had liquid water. It only receives 44 percent of the sunlight of Earth. It’s cold and inhospitable today — and should, by all measures, always have been. But once, Mars had flowing rivers and pooling lakes. For a window of time, it had all the right ingredients for life. Kite, assistant professor of geophysical science at the University of Chicago, and his colleagues dissected the history of early Mars, using data from the Mars Reconnaissance Orbiter to perform s
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