Earth Day Earth Day is an annual event celebrated on April 22 . Worldwide, various events are held to demonstrate support for environmental protection. First celebrated in 1970, Earth Day now includes events in mor…
Earth Earth is the densest planet in the Solar System and the largest of the four terrestrial planets. Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods…
Earth It requires no other name because it's the most important moon! You may read or hear people using Luna for the Moon, or Terra or Gaia for the Earth, or Sol for the Sun, but in English-speaking countries, these…
Probably most of us have seen meteors or stars shooting. A meteor is a light flash we see in the sky of the night when a small chunk of interplanetary debris burns up as it passes through our atmosphere. "Meteor" r…
A meteoroid in outer space is a small rocky or metallic body. Meteoroids are substantially smaller than asteroids, ranging from small grains to objects one meter wide. Objects smaller than this are classified as space dust or …
A planet whose orbit lies within the asteroid belt is called inner planets. A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals. Within the Solar System, …