Science- CL Chapter 18 Section 1

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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.


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