What is a satellite? - NASA
2018年9月5日 · A satellite is a body that orbits around another body in space. There are two different types of satellites – natural and man-made. Examples of natural satellites are the Earth and Moon. The Earth rotates around the Sun and the Moon rotates around the Earth.
The World in Real-Time | NESDIS - National Environmental Satellite ...
The World in Real-Time global map utilizes Geographic Information Systems (GIS) to provide a live satellite view of select data from geostationary and polar-orbiting NOAA satellites and partner satellites of the Earth from space.
Satellite | Orbits, Communication & Navigation | Britannica
satellite, natural object (moon) or spacecraft (artificial satellite) orbiting a larger astronomical body. Most known natural satellites orbit planets; the Earth’s Moon is the most obvious example.
What Is a Satellite? (Grades K-4) - NASA
2017年2月8日 · A satellite is an object that moves around a larger object. Earth is a satellite because it moves around the sun. The moon is a satellite because it moves around Earth. Earth and the moon are called “natural” satellites. But usually when someone says “satellite,” they are talking about a “man-made” satellite.
What Is a Satellite? | NASA Space Place – NASA Science for Kids
2025年1月2日 · A satellite orbits Earth when its speed is balanced by the pull of Earth's gravity. Without this balance, the satellite would fly in a straight line off into space or fall back to Earth. Satellites orbit Earth at different heights, different speeds and along different paths.
Satellite - Wikipedia
A satellite or artificial satellite[ a ] is an object, typically a spacecraft, placed into orbit around a celestial body. They have a variety of uses, including communication relay, weather forecasting, navigation (GPS), broadcasting, scientific research, and Earth observation.
What Is a Satellite? (Grades 5-8) - NASA
2014年2月12日 · A satellite is a moon, planet or machine that orbits a planet or star. For example, Earth is a satellite because it orbits the sun.
NASA Worldview
Interactive interface for browsing full-resolution, global, daily satellite images. Supports time-critical application areas such as wildfire management, air quality measurements, and weather forecasting. Data is generally available within three hours of observation.
What is a satellite? | Space
2022年1月17日 · A satellite is an object in space that orbits or circles around a bigger object. There are two kinds of satellites: natural (such as the moon orbiting the Earth) or artificial (such as...
Earth satellite | Definition & Facts | Britannica
2024年12月1日 · Earth satellite, artificial object launched into a temporary or permanent orbit around Earth. Spacecraft of this type may be either crewed or uncrewed, the latter being the most common. The idea of an artificial satellite in orbital flight was first suggested by Sir Isaac Newton in his book Philosophiae Naturalis Principia Mathematica (1687).