It’s believed that the core of the Earth formed early on in our planet’s history, when the entire planet was made of molten rock and metal. In this week's live QA, I talk about Elon Musk's hope of establishing a free Mars, the future of gravitational wave detectors, and what do I think about trying to live in other places in the Solar System? Thickness. 00:49:22 Would Mercury be better to live on? The inner core is also known to rotate, turning approximately 0.3 to 0.5 degrees per year relative to the rotation of the surface. It is the only liquid layer, and is mainly made up of the metals iron and nickel, as well as small amounts of other substances. 00:22:02 Are white holes real? Primordial Black Holes, Episode 687: Open Space 89: Scott Gaudi and the HabEx Mission, Creative Commons Attribution 4.0 International License. The Guide to Space is a series of space and astronomy poddcasts by Fraser Cain, publisher of Universe Today, Episode 696: Open Space 94: Is It Realistic to Declare a "Free Mars"? We have written many articles about the Earth for Universe Today. Temperature. 00:51:00 What is the Great Attractor? 00:17:05 More damage at Arecibo 00:28:30 Why doesn't Elon talk about nuclear propulsion or artificial gravity? As Earth spins on its axis, the iron inside the liquid outer core moves around. 00:58:15 How close can planets get to their star? Once thought to be a single ball of iron, scientists now know that the Earth’s core contains a solid inner core, surrounded by a liquid outer core. [/caption] 00:19:20 Why is the Moon the same visual size as the Sun? 00:53:16 Live underground on Venus? Since it was a liquid, the heaviest elements, like iron, nickel, gold and platinum sunk down into the center, leaving the less dense elements on top. The Outer Core. Here’s a link to NASA’s Human Spaceflight page, and here’s NASA’s Visible Earth. 00:00:00 Start Outer Core - Planet Earth. 00:33:00 What's going to happen with Artemis? 00:25:48 Any hard sci-fi The Outer Core is the second to last layer of the Earth. http://www.windows2universe.org/earth/Interior_Structure/interior.html Magnetism. 00:11:43 How sensitive will gravitational wave detectors become? 00:48:00 Give Venus an artificial satellite? Scientists believe that convection of liquid metals in the outer core create the Earth’s magnetic field. 00:42:43 Could we live on Venus? Earth's outer core is a fluid layer about 2,400 km (1,500 mi) thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. Want more resources on the Earth? Join us at patreon.com/universetoday. Further studies have refined the size of the outer core. Deep within the Earth, thousands of kilometers below your feet is the core of the Earth. 00:55:56 Could we terraform Ceres? And More…. Instead of bouncing off a solid core, Lehmann observed that the liquid outer core caused the waves to reflect differently from how they bounced off the inner core. Click to share on Facebook (Opens in new window), Click to share on Pocket (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Reddit (Opens in new window), Click to email this to a friend (Opens in new window), http://www.windows2universe.org/earth/Interior_Structure/interior.html, http://www.amnh.org/education/resources/rfl/web/essaybooks/earth/p_lehmann.html, Episode 695: Q&A 130: Does the Dark Forest Explain the Fermi Paradox? This work is licensed under a Creative Commons Attribution 4.0 International License. Here’s an article about the recent discovery that the Earth has an inner, inner core. And More…, Episode 694: Interview: Fred Watson, Australia's Astronomer at Large, Episode 693: Open Space 92: Why I Hate Embargoed News Stories, and More…, Episode 692: Open Space 91: Any Updates on Venus? 00:31:03 Why is artificial gravity research so expensive? 00:03:00 Thoughts on Bridenstine leaving NASA? 00:37:33 What do I think about GPT-3? http://en.wikipedia.org/wiki/Outer_core, Join our 836 patrons! This magnetic field extends outward from the Earth for several thousand kilometers, and creates a protective bubble around the Earth that deflects the Sun’s solar wind. 00:08:10 Should we declare a Free Mars? Composition. The inner core is thought to be 2,440 km across, and when you include the liquid outer core of the Earth, the entire core measures 6,800 km across; about twice as big as the Moon. Without this field, the solar wind would have blasted away our atmosphere, and Earth would be dead and lifeless like Mars. The outer core is responsible for Earth’s magnetic field. And More…, Episode 688: Remnants From the Early Universe. The transition between the inner core and outer core is located approximately 5,150 km (3,200 mi) beneath the Earth's surface. Sorry, your blog cannot share posts by email. http://www.amnh.org/education/resources/rfl/web/essaybooks/earth/p_lehmann.html The discovery that the core of the Earth contains a solid inner core surrounded by a liquid outer core was made by seismologist Inge Lehmann, who was studying how seismic waves bounce off the interior of the Earth. 00:55:00 Is Mercury a good source of metals? We have also recorded an episode of Astronomy Cast about Earth, as part of our tour through the Solar System – Episode 51: Earth. The inner core is thought to be 2,440 km across, and when you include the liquid outer core of the Earth, the entire core measures 6,800 km across; … See no ads on this site, see our videos early, special bonus material, and much more. Without the outer core, life on Earth would be very different. And More…, Episode 691: Interview: Seth Shostak from the SETI Institute, Episode 690: The Opposition of Mars with Ralph Crewe, Episode 689: Open Space 90: Could We Drill for Life on Mars? Support Universe Today podcasts with Fraser Cain. In other words, the inner core makes an extra rotation every 700-1000 years compared to the surface. Post was not sent - check your email addresses! Unlike the inner (or solid ) core, the outer core is liquid. 00:52:27 Is Titan the best? Sources: Let’s take a look at the outer core of Earth. The outer core is the third layer of the Earth. Its outer boundary lies 2,890 km (1,800 mi) beneath Earth's surface.
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