Solar System 1
What do all of the inner planets have in common?
They are small & have rocky surfaces
The sun produces energy by
nuclear fusion
In a heliocentric system, Earth revolves around
sun
What do all the four outer planets have in common?
Earth is thought to be at the center of the solar system in the __________ model
geocentric
the _____ consists of the sun, eight planets, and their moons, and several kinds of smaller objects
solar system
The number of sunspots on the sun caries over as period of about
11 years
a giant cloud of gas and dust
Most ancient astronomers thought that all celestial objects revolved around
Earth
All of the ____ ______ planets have many moons
gas giants
The solar wind is a stream of electrically charged particles that extend outward from the sun's?
corona
Mar's atmosphere is mostly
carbon dioxide
Jupiter's Great Red Spot is an __________ larger than Earth
Storm
meteorite
Most comets are found in the
Oort cloud
The sun's surface layer is the ________
photosphere
The heliocentric system gained support when Galileo observed that?
Venus goes through phases similar to those of Earth's moon
Where on Mars & in what forms does water exist at present?
exists mostly in solid forms (ice). Located in the two ice caps, atmosphere
What evidence indicates that liquid water existed on Mars in the past?
Surface features- by ancient streams, lakes, or floods
star
Describe how the solar system probably formed
Giant cloud of gas and dust. Under the pull of gravity, clouds shrank. Gas from the center formed the sun. Remaining gas and dust formed planets
The fact that each planet's orbit is an ellipse was discovered by
Kepler
Name the planets IN order
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Urnas, Noodles
Small asteriod-like bodies that became the buildign blocks for the planets are called
planetesimals
What layer are you looking at when you look at an image of the sun?