Does Zero Gravity Exist? If so, what is it?. Gravity holds many objects together in orbits. Moons…
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Does Zero Gravity Does Zero Gravity Exist? If so, what Exist? If so, what is it? is it?
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Transcript of Does Zero Gravity Exist? If so, what is it?. Gravity holds many objects together in orbits. Moons…
Does Zero Gravity Does Zero Gravity Exist? If so, what is it?Exist? If so, what is it?
Gravity holds many objects together in orbits.
Moons…
…more moons…
…satellites…
…comets…
Comet Neat NEATC3_sm.mov
…more comets…
Comet Maccholz
…and astronauts and their space shuttles.
But wait…
Why do astronauts in orbit seem to float? Have they escaped Earth's gravity?
G= 6.67300 × 10-11 N m2/Kg2
MEarth= 5.98*1024 Kg
REarth= 6.378 x 106 m
Calculate the force of gravity on a person on Earth. You can use your own mass.
Then calculate the force of gravity if you were an astronaut in orbit.
Shuttles orbit the Earth at around 200 miles (about 322 km) above the ground.
Fgrav=G*M1M2/r2
According to your results, does all the floating make sense? Is the force of gravity on Earth that much different than the one
astronauts feel?
What is happening here?
The astronauts and their craft are falling. They, AND their ships are in constant free-fall.
Look at Fgrav=G*M1M2/r2
Gravity is always attractive
solar system
galaxies
EVERYWHERE!
Clusters of galaxies
and gravitational lensing
That's it!That's it!
http://www.nasa.gov/returntoflight/multimedia/RTF_videos_search_agent_archive_1.html
