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.
You can contribute to a Roth at any age, even past retirement age, as long as youâre still earning taxable income. A working spouse can also contribute to a Roth IRA on behalf of a nonworking spouse. For a 401(k), the 2014 contribution limit is $17,500, unless youâre 50 or older, in which case the limit is $23,000.: Yes, you can contribute to both a Roth IRA and an employer-sponsored retirement plan such as a 401(k), SEP or SIMPLE IRA. However, each type of retirement account has annual contribution limits.