Core Current Affairs - 2019

Category Wise PDF Compilations available at This Link

Insight Mars lander detects likely Marsquake

National Aeronautics and Space Administration’s (NASA’s) InSight lander spacecraft has detected what’s believed to be a “marsquake” on the Red Planet. NASA scientists are still working to confirm the source of the faint trembling.

Scientists believe the trembling may not be due to wind or movement of the lander’s robotic arm but from below the Martian surface. If scientists confirm it would become the first seismic activity ever detected on Mars.

NASA’s InSight Lander Mission

NASA’s InSight stands for Interior Exploration using Seismic Investigations, Geodesy and Heat Transport is a Mars lander aimed to undertake the first-ever thorough checkup since it formed 4.5 billion years ago. Insight Mission will also measure tectonic activity and meteorite impacts on Mars.

NASA’s Insight is the first outer space robotic explorer to study in-depth the “inner space” of Mars: its crust, mantle, and core. Studying these internal structures will aid in answering the early formation of rocky planets in our inner solar system – Mercury, Venus, Earth, and Mars – more than 4 billion years ago, as well as rocky exoplanets.

Molten Jet Stream discovered deep inside Earth’s core  

Scientists for the first time have discovered the so-called molten jet stream within the Earth’s molten iron core using latest data obtained from three European satellites called Swarm.

The three satellites were launched in 2013 with the goal of studying Earth’s magnetic field.  The latest satellite data that helps create an sharpest ‘x-ray’ view of the planet.

Key Facts 
  • The molten jet stream is an accelerating band of molten iron circling the North Pole. It just like the jet stream in the atmosphere
  • It moves about 40 km per year, currently in a westward direction. This speed is three times faster than normal outer-core speeds and hundreds of thousands of times faster than rate at which Earth’s tectonic plates move.
  • It is located along a boundary between two different regions in the core. This movement is caused when liquid in core flows toward the boundary from both sides and then is squeezed out sideways.
  • Significance: The satellite data has helped clarify Earth’s inner workings and magnetic field. It showed that changes in the magnetic field are actually being caused by the molten jet stream.
  • The discovery can also add light in changing magnetic field of earth and may relate it with switch in direction of the jet stream.