Q: What is the approximate altitude of a satellite in Geostationary Orbit (GEO)?
Answer: 35,786 km
Explanation: A satellite at this specific altitude has an orbital period equal to Earth's rotation. This allows it to appear fixed over a single point on the equator. Most communication and weather satellites are placed in this high orbit.
Q: Which type of orbit is commonly used by the International Space Station (ISS)?
Answer: Low Earth Orbit (LEO)
Explanation: Low Earth Orbit typically extends from 160 km to 2,000 km above Earth's surface. It is the most accessible orbit for human spaceflight and satellite imaging. Objects in this orbit travel at very high speeds to avoid falling back into the atmosphere.
Q: What is the primary characteristic of a Polar Orbit?
Answer: It passes over the North and South Poles.
Explanation: A Polar Orbit has a high inclination, allowing a satellite to scan the entire Earth as the planet rotates beneath it. This makes it ideal for global mapping and reconnaissance missions. It is often a sub-type of Low Earth Orbit.
Q: Sun-Synchronous Orbit (SSO) is a special type of which major orbit?
Answer: Polar Orbit
Explanation: In an SSO, the satellite passes over any given point of the Earth's surface at the same local solar time. This ensures consistent lighting conditions for high-quality earth observation and climate monitoring. It is achieved by precisely balancing the orbit's altitude and inclination.
Q: Which orbit is primarily used for Global Positioning System (GPS) satellites?
Answer: Medium Earth Orbit (MEO)
Explanation: MEO is the region of space between LEO and GEO, typically around 20,200 km. It is used for navigation systems because it provides broad coverage with fewer satellites than LEO. Global systems like GPS and GLONASS operate in this altitude range.
Q: What is the orbital period of a satellite in a Geostationary Orbit?
Answer: 24 hours
Explanation: The period matches the Earth's sidereal rotation day, which is approximately 23 hours and 56 minutes. This synchronicity is what keeps the satellite stationary relative to the ground. If the period were different, the satellite would drift across the sky.
Q: Which orbit is highly elliptical and used to provide coverage to high-latitude regions like the Arctic?
Answer: Molniya Orbit
Explanation: A Molniya orbit allows a satellite to spend a large portion of its time over high-latitude areas. It has a high inclination and an eccentricity that prevents the satellite from moving too quickly over its target. This was originally developed by the Soviet Union for northern communications.
Q: What is a 'Graveyard Orbit' used for in space technology?
Answer: Storing decommissioned satellites.
Explanation: A graveyard orbit is located several hundred kilometers above GEO to safely dispose of old satellites. Moving satellites here prevents collisions in the valuable active communication bands. It is a critical part of space debris management.
Q: Which of these points are stable locations where a satellite can stay fixed relative to two large bodies (like Earth and Sun)?
Answer: Lagrange Points
Explanation: Lagrange points are positions where the gravitational pull of two large masses equals the centripetal force required for a small object to move with them. There are five such points for any system of two large bodies. The James Webb Space Telescope is located at the L2 point.
Q: What do we call the point in an orbit that is closest to the Earth?
Answer: Perigee
Explanation: Perigee is the specific term for the nearest approach in an Earth-centric orbit. At this point, the satellite travels at its maximum orbital velocity. The opposite point, where the satellite is farthest, is called the apogee.