the sun, planets, their moons, and smaller objects
200
What was Nicolaus Copernicus's discovery
He figured out the known planets orders, and that they revolved around the Sun
200
What is nuclear fusion?
When hydrogen atoms join to form helium?
200
What are sunspots?
Dark areas on the sun's surface where gas is cooler than surrounding gas
200
When do scientists think that the solar system formed
4.6 billion years ago
300
What did Tycho Brahe and Johannes Kepler discover?
They discovered that the planets orbit in ellipses (ovals)
300
What is the farthest planet from the sun?
Neptune
300
What is the inner layer of the sun's atmosphere
the photosphere
300
What causes solar flares
When loops of gas in sunspots regions suddenly connect
300
What planets do not have satellites
Mercury, and Venus
400
What did Ptolemy think about the solar system?
He thought that everything went around the Earth and that planets moved in small circles carried by big circles.
400
What is the planet that comes before the asteroid belt?
Mars
400
Name the layers of the interior of the sun from the inside to out
core, radiation zone, convection zone
400
What does solar wind cause
the auroras
400
What are planetesimal
one of the small asteroid like bodies that formed the building blocks of our planets
500
What did Galileo prove about the solar system? How?
He proved that the heliocentric model was right by discovering that Jupiter had 4 moons so not everything goes around the sun, he also learned that Venus has phases and that wouldn't happen if it just went around Earth