Скачать или смотреть Expected Topics for UPSC IAS Prelims 2020: Space & Innovation | Prelims

Dr. Manishika Jain explains Expected Topics for UPSC IAS Prelims 2020: Space & Innovation | Prelims

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Space
A Rare Transit of Mercury
 November 11-Mercury skipped the vast, glaring face of the sun.
 A rare celestial transit.
 Planet Mercury Facts
 Nearly tidally locked to the Sun.
 Known as a gravitational lock also.
 Rotation of the planet has been slowed down to match its orbit around the Sun.
 Second densest planet.
 One of the five planets-visible to the naked eye.
 No moons or rings.
 Second hottest planet.
 A very thin atmosphere.
 Mercury’s orbit important in proving Albert Einstein‘s theory of General Relativity.
 Only Two spacecrafts which visited Mercury: Mariner 10 and Messenger
Star Formation in Jellyfish Galaxies (Astrosat View)
 Jelly fish galaxy, JW100
 Using Ultraviolet Imaging Telescope.
 Galaxy
 A huge collection of gas
 Dust
 Billions of stars
 Solar Systems
 Held together by gravity
 Milky Way (Galaxy) - a supermassive black hole in the middle.
 Three types- Elliptical, Spiral and Irregular
 Tunning fork diagram-Two of the galaxy types are further divided and classified into a system.
 Spiral galaxies
 Most common type in the universe.
 Milky Way is a spiral-close by Andromeda Galaxy.
 Spirals-large rotating disks of stars and nebulae, a shell of dark matter surrounding.
 Galactic bulge-Central bright region
 Elliptical Galaxies
 Roughly egg-shaped (ellipsoidal or ovoid).
 Largely in galaxy clusters and smaller compact groups.
 Contains older, low-mass stars, and lack a great deal of star-making gas and dust clouds.
 Little new star formation.
 Messier 87- An elliptical galaxy. #examrace #upsc #ugcnet