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Scientific/Military satellites and explorers

Q) What is a Satellite?
Q) Whose Satellite Was the First to Orbit Earth?
Q) How is a Satellite Launched into an Orbit?
Q) What is a Satellite Launch Window?
Q) What is Inside a Typical Satellite?
Q) What Are the Types of Satellite Orbits?
Q) How Are Satellite Orbits Predicted?
Q) How Can I See an Overhead Satellite?
Q) What types of scientific satellites and explorers have there been?
Q) What scientific satellites and explorers are planned for the future?
Q) How much does one scientific satellite cost?
Q) What is a satellite's life span?
Q) What happens to scientific satellites when they reach the end of their life?
Q) How are names chosen for scientific satellites and explorers?
Q) Is remote sensing always done using satellites?
Q) Is there a difference between a Landsat satellite and a RADARSAT satellite?
Q) What is the difference between an ACTIVE and a PASSIVE sensor?
Q) How does radar work?
Q) Is there one remote sensing satellite that is the best?
Q) How high up are these satellites?
Q) How many remote sensing satellites are there?
Q) How do the remote sensing satellites "cover" the Earth?
Q) How long does it take for a satellite to "cover" the Earth?
Q) How is the satellite data sent from way up there, down to us?
Q) How long does it take the data to reach Earth?
Q) Why are some satellite images in black and white and others in colour?
Q) Why do we get such strange colours in many of these satellite images?
Q) Can sensors see underground or underwater?
How do we put a spacecraft into orbit?