Which sixteenth century scientist proposed the heliocentric theory which was later supported by galileo?.

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?