Lesson One
Ge is the ______ word for Earth.
Greek
Scientist use the ____________ to measure distances within the solar system.
astronomical unit (AU)
The sun's layers, from innermost, are the core, _____________, and convection zone.
radiation zone
One day is the time it takes a planet to rotate on its _____.
axis
What traditional costume do Scottish men wear when they attend formal events?
kilts
Helios is the ______ word for Sun
Greek
About 99.85 percent of the mass of the solar system is contained within the ________.
sun
You see the ______ when you look at an image of the sun.
photosphere
The solar wind can interact with Earth's magnetic field to create powerful electric currents that cause _____ near the pole.
auroras
The Taj Mahal is located in which country?
India
A(n) ______ is an oval shape, such as the planets' orbits.
ellipse
All but two planets in the solar system have a natural satellite, or ________.
moon
You see the middle layer of the sun's atmosphere, the ______, at the start and end of a total eclipse.
chromosphere
The sun produces energy through _______.
fusion
Which national park in the U.S. is famous for its geysers?
Yellowstone National Park
Galileo discovered _____ moons around Jupiter.
four
The four outermost planets in the sun's orbit are mostly made of liquid and _________.
gas
The corona sends out a stream of charged particles called the _________ _________.
solar wind
In the late 1500s, Ptolemy's observations were supplanted by those of ___________.
Tycho Brahe
The Sydney Opera House is located in which country?
Australia
Ptolemy's model explained the motions observed in the sky _________.
fairly accurate
_______, once the ninth planet in the solar system, is now considered a dwarf planet.
Pluto
About a fourth of the sun's mass is ______.
hydrogen
________ Model is one that Earth is at the center of the revolving planets an stars.
Copernican
The Great Wall of China stretches across how many provinces?
15