Exam

Front 1

What is the grapefruit model of the universe

Back 1

Is a condensed scale of the universe where the sun is the size of a grapefruit and the planets are the size of the ballpoint of a pen.

Front 2

What is the cosmic calendar?

Back 2

The cosmic calendarcalendar is the way to put ours universes 14 billion age into perspective with 1 minute of the first day of January is when the big bang happened. February is when the Milky Way formed. September 3 is when earth formed. September 22 is early life on earth. December 17 is the Cambrian explosion. December 26 is the rise of the dinosaurs. December 30 is the extinction of the dinosaurs. The present is the very last minute of December 31.

Front 3

How does Earth’s rotation and orbital motion affects our view of the night sky.

Back 3

With the Earth orbiting and rotating the night sky looks as though it moves every night. But the opposite is true. As the earth moves our view of the stars changes. The rotation of the earth also affects how we see the night sky.

Front 4

Why does Earth has seasons

Back 4

Earth has seasons because of its axis tilt. The earths axis causes that might befall differently on earth at different times of the year

Front 5

Why does earth have solstices and equinoxes?

Back 5

Solstice and equinox is Brett correspond to one of the four suppose the four special positions in earths orbit.

The June solstice called the summer solstice by people in the northern hemisphere occurs around June 21st and is the moment when the northern hemisphere is tilted most directly toward the sun and receives the most direct sunlight.

The December solstice called the winter solstice by the people in the northern hemisphere occurs around December 21 is it and is the moment when the northern hemisphere receives the least direct sunlight.

The march equinox called the spring equinox or vernal equinox by people in the northern hemisphere occurs around March 21 and is the moment when the northern hemisphere goes for being tip slightly away from the sun to being tipped slightly towards the sun equinox means equal nights.

The September equinox called the fall equinox by people in the northern hemisphere occurs around September 22 and is the moment when the northern hemisphere first starts to be tipped away from the sun.

I solstice could be either the longest day of the year or the shortest day of the year. And equinox is one there are 12 hours of daytime and 12 hours a night time

Front 6

What happens during a solar and/or lunar eclipse?

Back 6

A eclipse can only happen when the moon crosses the surface called a nod of the moons orbit that is when the moon is aligned approximately the same way throughout the year which means they lie on a nearly straight line with the sun and earth about twice each year. There are two types of shadows an Umbria is where the sunlight is completely blocked and the penumbra is where it is partially blocked. A total lunar eclipse is if the sun and earth and moon are nearly perfectly aligned and the moon passes through the earths Umbria. A partial lunar eclipse is if the alignment is somewhat less perfect only part of the full moon passes through the Umbria. Penumbral lunar eclipse is if the moon passes only Earths penumbra.

A total solar eclipse is if the Moon is in a part of its orbit where it is relatively close to earth the moon's Umbria can cover a small area of earth surface. And annular eclipse is if the eclipse occurs when the moon is in a part of its orbit that puts it farther from the earth and the Umbria may not reach the earth's surface. A partial solar eclipse is when only part of the sun is blocked from view by the moon.

Front 7

Why do we see phases of the moon?

Back 7

We see phases of the moon because the sun shines the same direction of the earth. Half of the ball always faces the sun and therefore is Bright while others have faces away from the sun is dark. As you look at the ball at different positions in the orbit around your head you see different combinations of it's bright and dark faces.

Front 8

Kepler three laws?

Back 8

Kepler first law is the orbit of each planet about the sun is an ellipse with the sun at one focus. Perihelion is the closest point in orbit near the sun. Aphelion the farthest point in orbit away from sun.

Kepler second law is a planet moves faster in that part of its orbit nearer the sun and slower when farther from the sun sweeping out equal areas in equal times.

Kepler third law is more distant planets orbit the sun at slower average speeds obeying the precise mathematical relation ship. P 2= A 3 to the power of that number.

Front 9

What contributions did Aristotle

Back 9

Aristotle argued forcefully in favor of an earth centered universe

Front 10

What contributions did Aristarchus

Back 10

Aristarchus was the first to suggest that earth goes around the sun

Front 11

What contributions did Eratosthenes

Back 11

Eratosthenes accurately estimated the circumference of the earth

Front 12

What Contributions did Ptolemy

Back 12

Ptolemy Earth centered model of the universe are made in years for some 1500 years

Front 13

Contributions of Copernicus

Back 13

Published a model of a sun centered solar system but the model didn't work because he still believe that planets traveled in perfect circles

Front 14

Contributions of Tycho

Back 14

Compiled the naked eye observations accurately using arc minutes and seconds to calculate the distance and motion of planets

Front 15

Contributions of Kepler

Back 15

Kepler an apprentice of Tyco took the naked eye observations and made a new model of a sun centered solar system but the planets are in an ellipse Kepler concluded three laws of planetary motion

Front 16

Contributions of Galileo

Back 16

Galileo overturned Aristotle's view of physics through multiple testing's Galileo helped prove Kepler's model Galileo also found four moons of Jupiter Galileo also prove that all the planets were on the same plane went or reading he proved this through observations of Venus

Front 17

Speed formula of

Back 17

Distance/Time

Front 18

Force formula of

Back 18

Mass x acceleration