http://www.qrg.northwestern.edu/projects...ts-gravity.html greater mass have greater gravity Qualitative Reasoning Group – Northwestern University http://www.qrg.northwestern.edu/projects...ts-gravity.html http://www.qrg.northwestern.edu/projects...ts-gravity.html Distance http://www.qrg.northwestern.edu/projects...ts-gravity.html http://www.qrg.northwestern.edu/projects...ts-gravity.html http://www.qrg.northwestern.edu/projects...ts-gravity.html Northwestern University Qualitative Reasoning Group http://www.qrg.northwestern.edu/projects...ts-gravity.html Why do mass and distance affect gravity? http://www.qrg.northwestern.edu/projects...ts-gravity.html