Special & General Relativity Questions and Answers
What happens in the space between gravitating bodies?
The gravitational field exists there, and determines how strongly particles will be affected by the force firlds of the two bodies. Exactly what the gravitational field is, we don't know, but suspect it a swarming hive of virtual 'gravitons' just like the other forces have their own quanta.
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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the NASA Astronomy Cafe, part of the NASA Education and Public Outreach program.