GRADE 9 SCIENCE

Generally, data tables compare other planets to Earth so Earth is often given the value of “1” for such things as distance from the sun (1 AU), period of rotation (1 day), mass (1) and gravity (1). For example, if a planet’s mass is “4”, it is 4 times greater than Earth whose mass is “1”. In general, the closer to the sun, the hotter the planet (Venus is the exception because of ... ................
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