Science- CL Chapter 18 Section 1
Why was Ptolemy's theory of the universe helpful even though it was incorrect?
It predicted the motions of the planets better than any other theory at the time.
What belief of other astronomers did Edwin Hubble's discovery confirm?
the universe was much larger than our galaxy.
How are computers used to study space?
they help process data and control movement of telescopes
Newton's laws of motion and gravity helped to explain many other scientists' observations. For example, what announced by Kepler was supported by Newton's laws?
why all planets orbit the most massive object in the solar system
The time required for the Earth to orbit once around the sun.
year
Most early astronomers thought that the universe consisted of
the sun, the moon and the planets
Which astronomer's theory led to major changes in science and society?
Copernicus
What laws did Kepler state are still in use today?
laws of planetary motion
Roughly the amount of time required for the moon to orbit once around the Earth.
month
What tools do astronomers use to study space?
new larger telescopes in space and on Earth, new models of the Universe, spacecrafts, computers,
What did Edwin Hubble prove in 1924?
other galaxy's existed beyond the Milky Way
How long did Ptolemy's Earth-centered theory remain the popular theory for the structure of the universe?
over 1,500 years
Who was one of the first scientists to use a telescope?
Galileo
Why was Brahe's work helpful even though his theory of the universe was incorrect?
He made very precise observations of the planets and the stars.
What did Kepler believe about the universe?
the planets revolved around the sun in elliptical orbits
What did Newton prove about gravity?
That all objects have a gravitational pull
What did many astronomers believe about galaxies prior to the 1920's?
That the Milky Way has every object in space.
In what way did people in ancient cultures mark the passage of time?
The seasonal circles of stars, planets and the moon
What was Brahe's theory of the universe?
The sun and moon revolved around the Earth, but the other planets revolved around the sun.
What were two milestones in the development of modern astronomy?
The telescope and Newton's theory
What was Copernicus's theory of the universe?
the sun was at the center of the universe, and the Earth and the other planets revolved around it.
What science did the study of the night sky eventually become?
astronomy
What four discoveries did Galileo make that showed planets are physical bodies like the Earth and not "wandering stars?"
craters and mountains on Earth's moon, four of Jupiter's moons, sunspots on the sun, and phases of Venus
The time required for the Earth to rotate once on its axis.
day
What was Ptolemy's theory of the universe?
the Earth was at the center of the universe, and the sun, moon, and other planets revolved around it.
