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A black hole can be produced if the stellar core left over after a supernova is larger than 3 M .
Semiannual Payments
Payments made twice a year as part of a financial agreement, often seen in the context of bonds or loans.
Interest Rate
The percentage of the principal amount charged by a lender to a borrower for the use of assets, usually expressed as an annual rate.
Down Payment
An initial, upfront payment made for the purchase of an asset, with the balance of the price to be paid later.
Present Value
The valuation today of an incoming stream of cash or one-time future payment, after accounting for a specified rate of return.
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