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.
1. There are restrictions on how much you can contribute to different accounts. The 2015 contribution limit for a 401(k) is $18,000; $24,000 if youâre 50 and over. Then you can also deposit up to $5,500 in a Roth or traditional IRA for 2015 ($6,500 if youâre 50 and up). Thatâs the combined limit for both types of IRAs, by the way. You canât put, say, $5,500 each into an IRA and a Roth IRA. If youâre maxing out your 401(k) and have more to save, opening a Roth IRA can help you sock away another $5,500 or $6,500 a year (for restrictions, see below).