Show:
23.1 & 23.4
23.2
23.2, 23.3, & 23.5
23.4
23.5
100
Johannes Kepler discovered that the orbits in which planets move around the sun are __________________.
What is elliptical?
100
Two planets with similar mass and size are ____________.
What is Venus and Earth?
100
Two of the inner planets are __________________.
What is Mercury, Venus, Earth, and/or Mars?
100
The planet with the lowest density and hundreds of thin rings is __________________.
What is Saturn?
100
The solid portion of a comet is its________________.
What is nucleus?
200
___________________ first developed the sun-centered model of the solar system in 1543.
What is Copernicus?
200
The second smallest planet and the one closest to the sun is _______________.
What is Mercury?
200
A planet that is very hot because of the greenhouse effect and that has sulfuric acid in its clouds is ______________.
What is Venus?
200
_______________ axis of rotation is almost parallel to the plane of its orbit.
What is Uranus's?
200
The solid portion of a comet is its__________________.
What is nucleus?
300
The Great Red Spot, a continuous storm, is located on the planet______________________.
What is Jupiter?
300
The largest known volcano in the solar system is an extinct volcano known as Olympus Mons found on the planet_______________________.
What is Mars?
300
The closest moon to Jupiter, ____________, is volcanically active.
What is Io?
300
_____________________is the largest satellite in the solar system.
What is Ganymede?
300
_______________ are small pieces of rock moving through space.
What is Meteroids?
400
The largest of_______ moons, Titan, is larger than the planet Mercury.
What is Saturn's?
400
A planet that is 150 million km, or one AU, from the sun is ___________________.
What is Earth?
400
The asteroid belt did not form a planet because ______________________.
What is Jupiter gravity kept it from forming?
400
Methane gives___________ their blue-green color.
What is Uranus and Neptune?
400
When small pieces of rock moving through space enter Earth's atmosphere and burn up, they are called______________________.
What is meteors?
500
Although _______________ is an outer planet, it is more like an inner planet.
What is Pluto?
500
A planet that appears red due to the iron oxide in its rocks is ____________________.
What is Mars?
500
Most asteroids are located in an area between ___________________.
What is Mars and Jupiter?
500
At times, the planet____________________ is actually the farthest planet from the sun.
What is Neptune?
500
Pieces of rock that actually strike Earth's surface are ____________________.
What is meteorites?