Short-period comets need roughly 200 years or less to complete one orbit, long-period comets take more than 200 years, and single-apparition comets are not bound to the sun, on orbits that take them out of the solar system, according to NASA.
Yes, you can invest in both an IRA and a 401k (or a Roth 401k and a Roth IRA) at the same time, or any combination of those accounts. And in some cases, based on the fees in your 401k, an IRA might actually be a better place to invest your money.
As I understand it, I can contribute up to $17,500 to my 401(k) per year and $5,500 to my personal Roth IRA. Thanks, -- Matt Morass. Dear Matt, Having a Roth 401(k) plan at work doesn't limit your ability to contribute to your personal Roth IRA. Depending on your income, however, you may have to fund a traditional IRA and then do a Roth IRA conversion.