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All of the protostars in this molecular cloud are about the same distance away. If we were to compare the red and blue main sequence stars that form from these protostars 100,000 years from now, after these protostars have all become main-sequence stars, what would we find?

If you were to gradually increase the frequency of the light wave that produced the images shown above, what would change in the picture shown above?

Global temperatures have increased over the last 100 years. What evidence is there that human activities are at least partially responsible for this increase?

Use this situation to answer the next two questions: Imagine you are on an escalator.   

When two of these positively charged styrofoam packing peanuts are brought closer to each other what happens to the electrical force between them?

Below is a picture of a nearby star-forming molecular cloud in our galaxy. Two southern hemisphere telescopes were used to take the pictures of protostars in this molecular cloud shown below. The next five questions test your understanding of the life of a star. Attributions Images ALMA (ESO/NAOJ/NRAO), J. Tobin; NRAO/AUI/NSF, S. Dagnello; Herschel/ESA. Protostarts in Orion Molecular Clouds [photograph]. (CC BY 3.0). Via NRAO.

You are given two clear solid crystals and told that only one of them is an ionic material. Both of them dissolve in water. How can you tell which one is the ionic material?

The next two questions deal with this situation: A large hammer and small nail are dropped from the same height at the same time. Both are originally at rest. Ignore air friction.

Professor Lawler borrows a spaceship and loads one of the lasers from a physics lab into it. She flies away in a straight line at constant speed going exactly half the speed of light.   As she flies off, she shines a beam of light from the laser back towards the science center and has one of her students measure how fast the light is going. What does the student find?

Where on the periodic table can you find elements that typically will “take” two electrons in chemical reactions?