COSMIC PERSPCTV&MOD MST ET AC&SKYGAZER 5.0 PK
COSMIC PERSPCTV&MOD MST ET AC&SKYGAZER 5.0 PK
8th Edition
ISBN: 9780134528090
Author: Megan O. Donahue Jeffrey O. Bennett
Publisher: Pearson Education
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Chapter 1, Problem 42EAP

Spacecraft Communication. We use radio waves, which travel at the speed of light, to communicate with robotic spacecraft. How long does it take a message to travel from Earth to a spacecraft at

a. Mars at its closest to Earth (about 56 million km)? b. Mars at its farthest from Earth (about 400 million km)? c. Pluto at its average distance from Earth (about 5.9 billion km)?

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If we send astronauts to Mars, there will be a time delay anytime we send or receive messages to them here on Earth. Given that Mars is an average of 54.6 million km away from Earth, how long is this time delay for a 2-way 'round-trip' communication - sent to Earth, then back to Mars? (this might be important in emergency situations) answer choices a)About 4 minutes. b)About 30 seconds. c)About 10 seconds. d)About 6 minutes.
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The closest approach distance between Mars and Earth is 56 million km. Assume you can travel in a spaceship at 58,000 km/h (which is the speed achieved by the New Horizons space probe that went to Pluto and is the fastest speed so far of any space vehicle launched from Earth). How long would it take you in hours to get to Mars at the time of closest approach?

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COSMIC PERSPCTV&MOD MST ET AC&SKYGAZER 5.0 PK

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