Universe

  POLLUTION The introduction of toxins into the environment that have a negative impact on it is known as pollution. Any material (solid, liquid, or gas) or energy (such as radioactivity, heat, sound, or light) can be considered a kind of pollution. Both naturally occurring contaminants and imported substances/energies can be considered pollutants, which are the elements of pollution. The term "pollution" generally implies that the contaminants have an anthropogenic source, which is a source produced by human activities such as manufacturing, extractive industries, poor waste management, transportation, or agriculture, although environmental pollution can also be caused by natural events. Point source pollution is frequently distinguished from nonpoint source pollution, which results from widely dispersed sources like micro plastics or agricultural runoff. Point source pollution originates from a highly concentrated single place, such as a factory or mine. Prior to the ...

  GLOBAL WARMING The gradual increase in the planet's surface temperature is known as global warming. Although this warming trend has been around for a while, the combustion of fossil fuels has greatly accelerated its speed during the past century. The amount of fossil fuels burned has grown along with the size of the human population. Burning fossil fuels such as coal, oil, and natural gas results in the phenomenon known as the "greenhouse effect" in the atmosphere of Earth. The greenhouse effect is a phenomenon that occurs when heat from the sun's rays enters the atmosphere but cannot leave when it is reflected off a surface and back into space. The heat cannot escape from the atmosphere because of the gases created during the combustion of fossil fuels. These greenhouse gases include nitrous oxide, carbon dioxide, water vapor, chlorofluorocarbons, and methane. World warming, sometimes referred to as atmospheric overheating, is the gradual increase in the averag...

  MOON The sole natural satellite of Earth is the Moon. It is the fifth biggest satellite in the solar system and the largest and most massive in relation to its home planet, with a diameter that is around one-fourth that of Earth (equivalent to the breadth of Australia). Its size exceeds that of the Solar System's other known dwarf planets. According to the geophysical definitions of the word, the Moon qualifies as a satellite planet since it is a planetary-mass object with a distinct rocky body. There isn't much of an atmosphere, hydrosphere, or magnetic field there. 'Jupiter's moon Io' is the only satellite in the Solar System known to have a higher surface gravity and density, with a gravity of 0.1654 g, or around one-sixth that of Earth. The average distance that the Moon travels around Earth is 384,400 km (238,900 mi), or around 30 times the diameter of Earth. Its gravitational pull is the primary cause of the tides on Earth and gradually lengthens the day...

  UNIVERSE Planets, stars, galaxies, and all other types of matter and energy make up the entirety of space, time, and all that is contained inside them. The most popular explanation for how the universe came to be is provided by the Big Bang theory. In accordance with this idea, the Big Bang occurred 13.787 0.020 billion years ago, and the universe has been expanding ever since. The observable universe has a diameter of about 93 billion light-years at the present time, which can be measured even if the total size of the universe's space is unknown. Ancient Greek and Indian philosophers created some of the earliest geocentric, or Earth-centered, cosmological theories of the cosmos. Nicolaus Copernicus created the heliocentric concept, which places the Sun at the center of the Solar System, as a result of centuries of improved astronomical observations. The work of Copernicus, Johannes Kepler's laws of planetary motion, and Tycho Brahe's findings were all used as foundat...

  ORGIN OF EARTH The only site where life has been known to have originated and found a habitable environment is on Earth, which is the third planet from the Sun. This is made possible by the fact that Earth is a water world—the only one in the Solar System that can support liquid surface water. The world's ocean, which covers 70.8% of Earth's surface, contains nearly all of the water on the planet. On Earth's land hemisphere, continential landmasses make up the majority of the remaining 29.2% of the planet's surface. The majority of Earth's land is covered by plants, despite the fact that the planet's land is also significantly covered in water. This water is mostly found in the form of enormous sheets of ice that cover the poles and contain more water than the planet's groundwater, lakes, rivers, and atmospheric water combined. The land on Earth is a part of Earth. The dynamic atmosphere of Earth maintains the planet's surface characteristics and shi...