It usually refers to the relevant power of ten in the scientific notation.
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An order of magnitude is a measure of the size or scale of a value or quantity. It represents a factor of 10 difference in numerical value. For example, if one value is one order of magnitude larger than another, it is 10 times greater.
thousands of times that of regular maatter
The order of magnitude of the distance from Earth to Mars is 7, because it falls within the range of 10^7 miles.
The US population is approximately 330 million, which is an order of magnitude of 8 when rounded to the nearest power of 10 (10^8). This means that the population is in the tens of millions.
The absolute magnitude of a star is a measure of its true brightness if it were placed at a standard distance of 10 parsecs from Earth. To calculate the absolute magnitude from the apparent magnitude (m) of 6, you would need to know the star's distance. Without this information, we cannot determine the absolute magnitude.
Canopus (-0.72), Vega (0.03), Arcturus (-0.04), Procyon (0.38), Hadar (0.61), Aldebaran (0.85), and Achernar (0.46) in order from brightest to dimmest apparent magnitude.