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Explainer: All about orbits - Science News Explores
Even in ancient times, stargazers knew that planets differed from stars. While stars always appeared in the same general place in the night sky, planets shifted their positions from night to night. They appeared to move across the backdrop of stars. Sometimes, planets even appeared to move backward.
Orbit - National Geographic Society
Satellite Orbits Artificial satellites are sent to orbit Earth to collect information we can only assemble from above the atmosphere. The first artificial satellite, Sputnik, was launched by the Soviet Union in 1957. Today, thousands of satellites orbit Earth.
Chapter 5: Planetary Orbits - NASA Science
The terms orbital period, periapsis, and apoapsis were introduced in Chapter 3. The direction a spacecraft or other body travels in orbit can be direct, or prograde, in which the spacecraft moves in the same direction as the planet rotates, or retrograde, going in a direction opposite the planet's rotation.
ESA - Types of orbits - European Space Agency
Reaching GEO in this way is an example of one of the most common transfer orbits, called the geostationary transfer orbit (GTO). Orbits have different eccentricities – a measure of how circular (round) or elliptical (squashed) an orbit is.
Orbit - Wikipedia
Further studies have discovered that nonplanar orbits are also possible, including one involving 12 masses moving in 4 roughly circular, interlocking orbits topologically equivalent to the edges of a cuboctahedron.
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