Planet Earth refers to the third planet from the Sun in our solar system and is unique for its ability to support life. It has a diverse range of environments including land, oceans, and atmosphere, all contributing to a dynamic ecosystem. Earth is composed mainly of rock and metal, has a solid and active surface with mountains, valleys, and volcanism, as well as liquid water covering about 71% of its surface. The atmosphere, composed primarily of nitrogen and oxygen, plays a crucial role in protecting living organisms from harmful solar radiation and in regulating temperature. Earth is home to millions of species, including humans, and is characterized by a complex web of biological interactions. Its climate varies significantly across different regions, influenced by factors such as latitude, topography, and ocean currents. Earth also experiences geological activity, leading to the formation of natural features and contributing to changes over geological time scales. The planet has a spherical shape and rotates on its axis, resulting in the cycle of day and night, and orbits the Sun in an elliptical path, completing a revolution approximately every 365.25 days.
Asteroid 2024 YR4 captured attention with its brief but significant entry on NASA's Sentry Impact Risk Table, initially alarming scientists with a 3.1% Earth impact risk. Revised calculations have decreased…