KERALA PSC / ASTRONOMY / EARTH / NOTES

 

KERALA PSC / ASTRONOMY / EARTH / NOTES

KERALA PSC / ASTRONOMY / EARTH / NOTES

 

·       Earth is the largest of the inner planets

·       Fifth largest planet in size

·       Earth’s axis is tilted at 23.5° from a line perpendicular to its path around sun

·       Only planet that is known to support life

·       Life evolved on earth nearly 3.8 billion years ago

·       Earth’s natural satellite-Moon is about one-fourth the size of earth

·       Called blue planet as it appears blue from space due to water (oceans) on earth

·       Equatorial diameter: 12756 km

·       Polar diameter: 12714 km

·       Speed: 107220 km per hour

·       Revolution: 365 days 5 hours 48 minutes 45.51 seconds

·       Rotation: 23 hours 56 minutes and 4091 seconds

 

KERALA PSC / ASTRONOMY / EARTH / NOTES