Earth and Neighbour's
Earth is the third planet from the Sun and the only astronomical object known to harbor life. Earth's axis of rotation is tilted with respect to its orbital plane, producing seasons on Earth.
The gravitational interaction between Earth and the Moon causes tides, stabilizes Earth's orientation on its axis, and gradually slows its rotation. Earth is the densest planet in the Solar System and the largest and most massive of the four rocky planets.
Earth and it's Neighbour's There are eight planets revolving around the sun. We call that an orbit. These planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Lots of smaller worlds orbit the Sun. Other dwarf planets, Ceris, Haumea, MakeMake, Pluto, and Eris also rotate around Sun.
The SPACE Universe is so vast that we cannot appreciate its size without making leaps of scale. When dealing with the vast distance in space , kilometers are not big enough. Instead astronomers use the speed of light as yardstick
The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud.
The vast majority of the system's mass is in the Sun, with the majority of the remaining mass contained in Jupiter.
The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal.
The four outer planets are giant planets, being substantially more massive than the terrestrials.
The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium;
The two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatile's, such as water,ammonia and methane.
All eight planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.