What is the name of this model?

What is Kepler's 1st law?

What is the eccentricity of a perfect circle?

What TWO factors affect the gravitational pull of an object?

An astronomical unit is the distance from the __________ to ______________.

Which of the planets has the shortest orbital period?

Energy is created in the core when two _____________ atoms join together to form a ______________ atom.

Because of the tilt of the Earth, as it revolves around the sun, this happens

The amount of light you see on the moon as it goes around the Earth

Which type of Eclipse is shown in the picture?

Which type of Eclipse is shown in the picture?

Less than average tide occurring 1st and 3rd quarters of the moon

Highest tides when the Earth, sun and moon are lined up in a row

Earth is tilted at _____________ degrees.

On which of the following days the day and night are of equal duration throughout the world?

When the moon waxes, it

When the moon wanes, it

Which moon is shown in the picture?

Which phase of the moon is shown in the picture?

What planet is closest to the sun?

What are the four inner planets?

Which planet below is farthest from the sun?

What are the outer planets?

The sun is a ___________.

Which planet is known as Earth's twin because it is a similar size?

What is the smallest planet in the solar system?

Our sun is currently in what star stage?

Main sequence stars are made primarily of which elements?

The stable and longest lasting period of a star’s life cycle is called:

What fuel do main sequence stars use?

The graph shows the observed water levels, in feet (ft), for a tide gauge located at Montauk, New York, on the easternmost end of Long Island, from January 24, 2008 to noon on January 25, 2008.

What causes the water-level variation pattern shown by the graph?

The graph shows the observed water levels, in feet (ft), for a tide gauge located at Montauk, New York, on the easternmost end of Long Island, from January 24, 2008 to noon on January 25, 2008.

What causes the water-level variation pattern shown by the graph?

Which two characteristics do all Jovian planets have in common?

Which list shows stars in order of increasing temperature?

A blue shift of the light from a star indicates that the star

Base your answer to the following question on the diagram below and on your knowledge of Earth

science. The diagram represents Earth in its orbit around the Sun. Locations A through D represent four

positions of Earth in its orbit. Earth is closest to the Sun (perihelion) at position A, and farthest from

the Sun (aphelion) at position C.

At all four positions, the northern end of Earth's axis points toward

Evidence that the universe is expanding is best supported by the observation that the wavelengths of light from distant galaxies are shifted toward the

Which event occurred approximately 4.6 billion years ago?

Energy is produced within a star's core by the process of

Earth, the Sun, and billions of stars are contained within

Planets that are closest to the Sun are identified as

As a rotating cloud collapses its rate of rotation

The diagram below represents the light spectra given off by the same element as observed under two

different conditions. Spectrum A was observed when that element was heated in a laboratory.

Spectrum B shows the same element as seen in the light from a distant star.

The light spectrum observed from this distant star shows a

The model below shows the apparent path of the Sun

as seen by an observer in New York State on the first

day of one of the four seasons.

This apparent path of the Sun was observed on the first day of

One factor responsible for the strength of gravitational attraction between a planet and the Sun is the

Which event takes the most time?

Which star has a surface temperature most similar to

the surface temperature of Alpha Centauri?

The best evidence of Earth's rotation is provided by the

All of space and everything inside it is known as

The process that produces light and heat energy within a star is called

All of the planets and other celestial objects that are held in orbit by the sun is known as

The force responsible for holding a celestial object in orbit is called

A natural satellite that orbits a planet is known as

A theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago.

A large grouping of stars, planets, gas, and dust in space held together by gravity.

A unit of length equal to the distance that light travels through space in one year.

The change in wavelength that allows us to determine if an object if moving toward us or away from us

The explosion of a massive star at the end of its life cycle

what is a nebula?

what forces pulls the matter in a nebula together

The time it takes for a planet to rotate once on its axis.

The path a celestial object takes around another object (moons around a planet, planets around a star, etc).

A model that puts the Sun in the center of the solar system. The Earth is just one of many planets that revolves around the Sun.