Dark Matter

Ancient Greeks thought that the universe was composed of four elements.  What do you think those elements were?

What is the name of this figure?

• blocks of elements

• periodic table of elements

• periodic elementals

• elemental blocks of periodic elementals

What is the approximate percent of the universe that we can see or measure?

• 95%

• 100%

• 5%

• 50%

We cannot see enough matter in galaxies to physically hold them together.  What, then, is holding galaxies together?

• dark matter

• super universal glue

• protons and electrons and neutrons

• atoms

What is currently thought to be causing the expansion of the universe?

• dark matter

• dark energy

• visible matter

• big bang

Which color in the graph represents dark energy?

Which color represents matter that we can see?

• purple/white

• purple/red

• white/red

• red/white

Reflection: 

Write a brief reflection of what you learned, questions you may have or ideas that occurred to you while watching this video.