Astronomy test 1 module 1&2 info

The star that provides energy for life on Earth is

the sun

Even with the best and largest telescopes, we can't see all the stars in the Milky Way Galaxy, even though these same telescopes can show us other galaxies. Why is that?

dust in the space between stars builds up over large distances and blocks the light of stars behind the dustier parts of the Milky Way

By the term universe, astronomers mean

everything that we can observe

Why did early civilizations observe constellations?

for practical reasons, such as navigation and helping to determine seasons

The diameter of the observable universe is about ...

93 billion light years.

In section 1.1 of our textbook, science is compared to what?

A progress report

How many people in human history have seen the full circle of the Earth with their own eyes? A) 15 B) 32 C) 24 D) 57

C) 24

An effective theory must:

be continuously tested.

Modern scientific theories are NOT:

perfect.

The highest point in your night sky is called your ...

zenith

If a star is on our horizon, the what is it's altitude?

0 degrees

In the video, "To Scale: The Solar System," Saturn and the Sun were about how far apart.

1.1 miles

1 mile to km

1.609 km

A star is 230 light years away. The light we see tonight from that star left it

230 years ago

You are outside at night and you locate the North Star 25 degrees above the northern horizon. Where on the Earth are you?

25 degrees north latitude

According to our textbook, during the Apollo flights to the Moon, about how long was the delay between the time Mission Control asked a question and the time the astronauts responded?

3 seconds

The average distance between the Sun and the Earth is called... A) an astronomical unit. B) an arc minute. C) a farthing. D) a parsec.

A) an astronomical unit.

When the authors of our textbook say that astronomers are like police detectives trying to solve crimes, they are explaining that:

Both astronomers and detectives must test their hypotheses against any evidence that they gather

Which of the choices below correctly lists things in order from largest to smallest? A) Milky Way, Universe, Solar System, Earth, Sun B) Universe, Solar System, Milky Way, Sun, Earth C) Solar System, Earth, Universe, Milky Way, Sun D) Solar System, Sun, Milky Way, Earth, Universe E) Universe, Milky Way, Solar System, Sun, Earth

E) Universe, Milky Way, Solar System, Sun, Earth

According to the video, "Known Universe," we have mapped far-away galaxies in all directions.

False

The natural object (not one that humans built) in space that's closest to Earth is

The Moon

If you create a scale model of the solar system, stand on your Earth's orbit looking back at the model Sun in the direction of the actual rising Sun, how big will your model Sun be compared to the actual Sun's disk in the sky?

The model and the actual Sun will be the same angular size

Of these which is the closest to us? The Moon The closest spiral galaxy The Sun The center of the Milky Way Mars

The moon

Of these, which is the largest? Jupiter Earth The Solar System The Universe The Milky Way Galaxy

The universe

We are able to see the planets in our solar system in the night sky only because they reflect the light from our Sun.

True

The location of the Earth in the Milky Way Galaxy is

a little less than 30,000 LY from the center

A large body in space that consistently makes its own light (instead of merely reflecting another body's light) is called

a star

How long does it take light to travel one astronomical unit (AU)?

about 8 minutes

The laws of nature (as determined by scientists)

are often written in the language of mathematics

The way scientists know that a hypothesis in astronomy is a reasonable description of nature is to

do experiments and observations about the predictions of the hypothesis

A theory is a framework of ________ used to explain a set of___________ about the universe

ideas, observations

You are on a camping trip, far away from city lights. You look up into the dark night sky, and see lots of stars, some brighter, some dimmer. All the stars you see with your unaided eye are

in the Milky Way Galaxy

A light year is

the distance that light travels in one year