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Why were ancient people unable to detect stellar parallax

They did not have the ability to measure very small angles

Why do we see essentially the same face of the moon at all times

Because the moon's rotational and orbital periods are equal

By the Late 1600's, science and technology in China fell behind Europe. Many historians beliee that this happened because

A culture of secrecy discouraged broad collaborative efforts

Ptolemy was important in the history of astronomy because he

Developed a model of the solar system that made sufficently accurate predictions of planetary positions to remain in use for many centuries

The age of the universe is

Between 10 billion and 16 billion years

In which of the following cases would you feel weightless

while falling from a roof

Which of the following is not a conserved quantity


About where is our solar system located within the Milky Way Galaxy

about two-thirds of the way from the center of the galaxy to the outskirts of the galactic disk

What is the Ecliptic

The suns's apparent path along the celestial sphere

all the following statments are true. Which one follows directly from Kepler's third law

Venus orbits the sun at a slower average speed then Merbury

Modern telescopes are capable of seeing bright galaxies up to about

10 billion light-years away

The amount of time between successive passes of the star Sirius across the meridian is

23 hours 56 minutes

Which of the following is an example in which you are traveling at constant speed but not at a consistent velocity

driving around in a circle at exactly 100 km/hr

What is the sun mainly made of

Hydrogen and Helium

What quantities does angular momentum depend on

mass, velocity, and radius

What do the structures of Stonehenge, the Templo Mayor, the Sun Dagger, and the Big Horn Medicine Wheel all have in common

They were all used by ancient peoples for astronomical observations

which of the following BEST describes the origin of ocean tides on Earth

Tides are caused by the difference in the force of gravity exerted by the moon across the sphere of the earth

Considering Einstein's famous equation, E=mc2, which of the following statements is TRUE

A small amount of mass can be turned into a large amount of energy

the allowed shapes for orbits under the force of gravity are

elipses, parabolas, and hyperbolas


the average distance from Earth to the Sun

The force of gravity is an inverse square law. This means that, if you double the distance between two large masses, the gravitational force between them

weakens by a factor of 4

He discovered what we now call Newton's first law of motion


Roughly how many stars are there in the Milky Way Galaxy

100 million

According to the UNIVERSAL LAW OF GRAVITATION, the force due to gravity is

inversely proportional to the square of the distance between objects

He discovered that the orbits of planets are ellipses


Suppose an object is moving in a straight line at 50 mi/hr. According to Newtons first law of motion, the object will

continue to move in the same way until it is acted upon by a force

Which of the following correctly describes the MERIDIAN in your sky

a half-circle extending from your horizon due north, through your zenith, to you horizon due south

How did Eratosthenes estimate the size of the Earth in 240 BC

by comparing the maximum altitude of the Sun in two cities at different latitudes

Which of the following is the reason for the leap years

Earth year being a non-integer number of earth days

The controversial book of this famous person, published in 1543 (the year of his death), suggested that Earth and other planets orbit the Sun


When Copernicus first created his Sun-centered model of the universe, it did not lead to substantially better predictions of planetary positions than the Ptolemaic model. Why Not?

Copernicus used used perfect circles for the orbits of the planets

The Sun is rising in the east and will be on your meridian in 2 hours. What time is it?

10 AM

Momentum is defined as

mass times velocity

Why do we have seasons on Earth

As earth goes around the Sun and Earth's axis remains pointed toward Polaris, the Northern and Southern hemisphere alternately receive more and less direct sunlight

Which of the following is the reason for the solar day being longer then a sidereal day

The combined effect of the rotations of Earth and its orbit about the Sun

At approximately what time would a full moon be on your meridian


All of the following are true. Which of the following gives evidence that Earth's orbit is not perfectly circular

Both A and B

A) The Sun's angular size changes throughout the year

B) Earth's seasons are not exactly equal length

If your mass is 60 kg on earth, what wold your mass be on the Moon

60 kg

Radiative energy is

energy carried by light

At which lunar phase(s) are tides most pronounced (e.g. the highest high tides)

Both new and full Moons

According to what we now know from Newton's laws, which of the following BEST explains why Kepler's second law is true

A planet's angular momentum must be conserved as it moves around its orbit

Suppose the date is March 21 and the sun passes through your zenith at noon. Where are you

The Equator

Which scientists played a major role in overturning the ancient idea of an Earth-centered universe, and about when?

Copernicus, Kepler, and Galileo; about 400 years ago

Which of the following best describes the modern definition of a constellation

a region of the celestial sphere

We describe a position on Earth's surface by stating its

latitude and longitude

What is a CIRCUMPOLAR star

a star that always remains above your horizon

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