What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of

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I'm kinda confused, I understand what came first in the formation but how do we know which part came first in the formation of our solar system?

When iron is exposed to oxygen it rusts or oxidizes. Which of these represents the balanced equation for this chemical change? A) Fe + O → FeO B) FeO → Fe + O C) Fe + O2 → Fe2O3 D) 4Fe + 3O2 → 2Fe2O3

The study of origins and life of the planet earth is called

The atomic mass of gold is 0.197 kg/mole. how many moles are in 0.566 kg of gold.

What are the Rules of magnetism

Two spheres of the same radius, but of different masses, are both fully submerged in water. The lighter sphere is held below the water line by a rope anchored to the bottom of the container. The heavier sphere is suspended from a rope.

How does an increase in thermal energy affect molecules?

Which of the following is an example of applied research?

A Cadillac Escalade has a mass of 2,569.6 kg, if it accelerates at 4.65 m/s^2 what is the net force on the car?