Yes. When objects are in orbit around each other, there is a strong pull of gravity between them. For example, we commonly say that the Moon is in orbit around the Earth. However, the Moon pulls back on the Earth as well. This changes the Earth a little. One way we see this happening is the ocean tides.
An annuity is a long term investment that is issued by an insurance company designed to help protect you from the risk of outliving your income. Through annuitization, your purchase payments (what you contribute) are converted into periodic payments that can last for life.
The rate of return on an annuity will widely vary depending on the type of contract it is and the carrier that issues it. A fixed annuity is safer since there is a guaranteed interest rate. A variable annuity will invest (or can invest) a portion of the funds in equities, and therefore has a higher potential for appreciation. But it could still under-perform a fixed annuity. A full-time investment broker or financial planner is a great resource for advice.