We can observe only a portion of the entire universe. Because the universe is only about 14 billion years old, light has only had about 14 billion years to travel through it. Therefore, the most distant regions of the universe we can see are about 14 billion light-years away. This is the extent of the observable universe, but the entire universe is probably much larger.
According to the Internal Revenue Service, any interest you receive, or that is credited to an account and is available for withdrawal, is taxable in the year you receive it. This money is included in your annual income when you file your taxes, making the tax rate on interest equal to your normal income tax rate.
Later, when you retire, withdrawals you make in accordance with the rules of your account are not taxable. Because Roth IRA contributions, instead of withdrawals, are taxed, the government does not impose a Required Minimum Distribution rule on these accounts. This makes Roth IRAs a great option for people who want to use their retirement account to pass on wealth to their children or grandchildren, instead of using the account to fund their own retirement.