Any physicists out there? I have a question:
If mass/matter causes a gravitational field,
Would antigravity be possible with antimatter?
And if it did, would it be possible to use this antigravity to escape Earth's gravity and achieve orbit?
Anti-matter has the same mass as the equivalent normal matter. The electrical charges are reversed, though. Gravity is the resuly of mass, therefore anti-matter has the same gravity as normal matter.
http://en.wikipedia.org/wiki/Antimatter
"Today's standard model shows that every particle has an antiparticle, for which each additive quantum number has the negative of the value it has for the normal matter particle. The sign reversal applies only to quantum numbers (properties) which are additive, such as charge, but not to mass, for example. The positron has the opposite charge but the same mass as the electron. An atom of antihydrogen is composed of a negatively-charged antiproton being orbited by a positively-charged positron."