Deep Science | Documentary Tapes

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...

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 mo...

 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 ...