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What can solve the flatness and horizon problem in cosmology, and why?
Mass
An estimation of the quantity of matter present in an object, commonly measured in grams or kilograms.
Significant Figures
Significant figures are the digits in a number that carry meaningful contributions to its measurement accuracy, including all the non-zero digits, zeroes between significant digits, and trailing zeros in a decimal.
Mass
A property of a physical body, indicating the amount of matter it contains and a measure of its resistance to acceleration when a force is applied.
Physical Change
Changes affecting the form of a chemical substance, but not its chemical composition, such as melting or freezing.
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