In What Year Did The Louisiana Purchase Happen?

Did You Know!

Ordinary matter, which makes up stars, planets, and everything we see, constitutes only about 5% of the total mass-energy content of the universe. The remaining 95% is made up of dark matter and dark energy. Dark matter doesn't emit, absorb, or reflect light, making it invisible and detectable only through its gravitational effects. Dark energy is a mysterious force driving the accelerated expansion of the universe.