The document discusses the size and composition of the universe. It begins by defining what the universe contains, including empty space, energy, dark energy, and matter. It then explains the Big Bang theory, how the universe began as an incredibly small, dense point approximately 13.7 billion years ago and has been expanding ever since. It provides examples of scientific notation used to measure the vast distances within the universe from Earth to other galaxies. The document concludes by discussing potential futures of the universe, whether it will expand forever or potentially collapse back on itself in a "Big Crunch."

1. The Universe6th Grade Science

2. I. What is it?A. Empty Space NothingB. Energy 8th GradeC. Dark Energy (Expansion force)D. Matter 7th GradeE. Dark Matter (unseen matter)

3. II. Big BangUniverse is expandHubble’s LawFarther away then the faster it is movingCosmic RadiationEnergy glow from all over the universe (from large explosion)

4. II. Big BangB. Find starting position and time.Microscopic point in space (smaller than atom)13.7 billion years agoC. No sound in space (was meant as a joke)

5. III. SizeScientific Notation1,200 = 1.2 x 1039,500,000,000,000,000 = 9.5 x 1015DistancesDiameter Earth 1.3 x 107 mDiameter Sun 1.4 x 109 mDiameter Andromeda 2 x 1021 mKnown Universe 1 x 1026 m100,000,000,000,000,000,000,000,000 mLight Year 1. Distance light travels in one year 2. Speed of light is 300,000 km/second

6. IV. GalaxiesHuge cluster of stars, dust, and gasHeld together by gravityNumber (125 billion)TypesSpiralEllipticalIrregularQuasarsVery distantVery brightNew Galaxy

7. IV. GalaxiesE. Milky Way 1. 25,000 light years to centerF. Biggest (IC1101 = 60 x our)G. Farthest (1689-2D1 13 billion LY)

8. V. FutureExpand ForeverEnd cold and darkDark Energy – Increasing speed every dayBig CrunchReturn to original point in spaceDark Matter - 90% of matter can not be seenStars in galaxies should be flying away but don’t