Moon and Stars
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Can Laws & Theories change?
Yes.
How can Laws and Theories Change?
With new evidence.
Does Science ever PROVE?
No, only support.
What’s the difference between repetition & replication?
Repetition is your experiment; replication is someone else doing your experiment.
Why do scientists repeat tests?
Reliability.
Compare line graphs, circle graphs & bar graphs.
Bar = compare; Pie = out of a whole; Line = over time.
What makes a good HYPOTHESIS?
Testable, independent + dependent variable.
What is a control group?
Control group gets no change.
Compare & Contrast APPARENT & ABSOLUTE Magnitude.
Apparent is how it appears; Absolute is how it actually is.
How do the Scales for apparent & absolute magnitude work?
The more negative, the brighter.
Put in order from closest to farthest: the Sun, the Andromeda Galaxy, the North Star & Mars.
Mars, Sun, North Star, Andromeda.
List 4 characteristics of the terrestrial planets.
Few moons, no rings, long days, rotates slow.
List 4 characteristics of the gas giants.
Lots of moons, mostly hydrogen and helium, rotates faster.
Why do the stars in the night sky seem to move like the planets?
Because we move.
Where do stars spend most of their lives (90%)?
Main sequence.
What COLOR STARS are on the MAIN SEQUENCE?
red, orange, yellow, green, blue
What TYPE of GALAXY is the MILKY WAY?
Spiral
What happens to NORMAL sized STARS after they run out of HYDROGEN?
turns to red giant
Which SOLAR EVENTS interfere with the COMMUNICATIONS on Earth?
Solar flares, sunspots, prominences
Where is our SUN LOCATED in the main sequence?
Close to the middle
What does a STARS COLOR indicate?
temperature
What 2 FACTORS AFFECT LUMINOSITY (ABSOLUTE BRIGHTNESS)?
Size and temperature
How do stars get their ENERGY?
nuclear fusion
How DOES NUCLEAR FUSION WORK?
2 hydrogens become 1 helium