SOLAR SYSTEM

Detailed explanation-1: -The International Space Station is in a LEO about 400 km (250 mi) to 420 km (260 mi) above Earth’s surface, and needs re-boosting a few times a year due to orbital decay. The Iridium telecom satellites orbit at about 780 km (480 mi).

Detailed explanation-2: -Low-Earth orbit provides an ideal environment for crew training, research, and hardware testing for exploration use. The ISS has pioneered this domain, and post-ISS, NASA will always have a need for access to a human-rated destination in LEO.

Detailed explanation-3: -A low Earth orbit (LEO) is, as the name suggests, an orbit that is relatively close to Earth’s surface. It is normally at an altitude of less than 1000 km but could be as low as 160 km above Earth – which is low compared to other orbits, but still very far above Earth’s surface.

Detailed explanation-4: -A low earth orbit (LEO) satellite is an object, generally a piece of electronic equipment, that circles around the earth at lower altitudes than geosynchronous satellites. LEO satellites orbit between 2, 000 and 200 kilometers above the earth.

Detailed explanation-5: -Satellites in LEO typically take between 90 minutes and 2 hours to complete one full orbit around the Earth. Low altitudes in combination with short orbital periods make LEO satellites ideally situated for remote sensing missions, including Earth observation and reconnaissance.