Earth – Home Sweet Home

Welcome to Home !!! Earth is the only celestial body to harbor life as we know it. Our planet was formed around 4.5 billion years ago. Earth revolves around the sun every 365.25 days and rotates on its axis in 23 hours 56 minutes and 4 seconds.

Mass: 5.972 ×10^24 kg

Radius: 6,371 Km

Density: 5.514 g/cm^3

Escape Velocity: 11.18 km/sec

Gravity: 9.8 m/s^2

Distance from Sun: 151.65 million km (8.3 light minutes)

Life first originated on earth around 4.1 billion years ago according to some geological evidence. Within the first billion years of Earth’s history, life appeared in the oceans and began to affect Earth’s atmosphere and surface, leading to the rapid increase of anaerobic (don’t need oxygen to survive) and, later, aerobic (need oxygen to survive) organisms. Over 99% of all species that ever lived on Earth are extinct.

Life as we know it is possible on Earth due to many favourable conditions which can’t be found on any other planet of our solar system such as strong magnetic field to deflect the harmful cosmic rays, ozone layer to protect the life form from UV rays, falling in habitable zone of sun, atmosphere composition, enough water for life to take a breath and many more.

The shape of Earth is nearly spherical. There is a small flattening at the poles and bulging around the equator due to Earth’s rotation. To second order, Earth is approximately an oblate spheroid, whose equatorial diameter is 43 kilometres (27 mi) larger than the pole-to-pole diameter.

Bonus fact : Earth is revolving around the sun at 30 km/sec and rotating on its axis at about 1600 km/hr