Questions with the keyword 'gravity'

• What does it mean to say that something is massless? Would these massless particles be affected by any gravitational by rajathjackson to Chris, Dave, David, Fiona, Jack Comments: (No comments so far )
• What is the speed of gravity? by rajathjackson to Chris, Dave, David, Fiona, Jack Comments: (No comments so far )
• in the future is it possible that there would be a machine that decreases gravity in an ordinary room? by lucysey to David Comments: (No comments so far )