1. Habitable Earth.pptx

UNIVERSE AND THE SOLAR SYSTEM  Origin of the universe Big Bang Theory As the currently accepted theory of the origin and evolution of the universe, the Big Bang Theory postulates that 13.8 billion years ago, the universe expanded from a tiny, dense and hot mass to...

UNIVERSE AND THE SOLAR SYSTEM  Origin of the universe Big Bang Theory As the currently accepted theory of the origin and evolution of the universe, the Big Bang Theory postulates that 13.8 billion years ago, the universe expanded from a tiny, dense and hot mass to  comparison VENUS EARTH MARS Mass 4.87 5.97 0.639 (10^24 kg) Diameter (km) 12,104 12,742 6,779 Density 5,243 5,514 3,933 (kg/m3) Gravity (m/s2) 8.9 9.8 3.7  comparison Escape VENU EARTH MARS S velocity - Escape minimum speed Velocity 10.4 11.2 5 an object needs (km/s) to escape a Surface 92 1 0.01 planet's pull of Pressure gravity. Compositio 95% Surface 96% n of 77% N CO2 Atmosphere CO2 21% 02 pressure - 2.7% N 1.6% atmospheric 3.5% 1% Ar N pressure at a Ar  comparison VENUS EARTH MARS Distance from 108.2 149.6 227.9 Sun (10^6 km) Orbital Period 224.7 365.3 687 (days) Orbital Velocity 35 29.8 24.1 (km/s) Length of Day 5832 24 25 (hours)  comparison Venus, Earth, and Mars are part of the inner terrestrial or "rocky" planets. Their composition and densities are not too different from each other. Venus is considered to be the Earth's twin planet. It has a very similar size and mass with  comparison Orbital period and velocity are related to the planet's distance from the sun. Among the three planet, Venus is the nearest and Mars is the farthest from the Sun. Rotational speed of Earth and Mars are very similar. Rotational speed of Venus is extremely slow. Abundance of liquid water on Earth, hence  Questions Is Earth habitable? What factors would make a planet habitable? m