Quiz 1 || Astro 5

Arrange the following items according to size, from the smallest to the largest.

Earth, Sun, galaxy, solar system, giant star.

Earth, giant star, Sun, galaxy, solar system.

Earth, Sun, giant star, solar system, galaxy.

Earth, Sun, giant star, galaxy, solar system.

If our sun is expected to last about 6 billion years longer, then turn to be a planetary nebula for several thousand years, about how much of the rest of its life will our sun be a planetary nebula?

A billionth

A tenth

A hundredth

A millionth

In what sense are we "star stuff"?

We could not survive without light from our star, the Sun.

We are made from the debris of previous generations of stars.

Our overall chemical composition is about the same as that of stars.

Movie stars and other people are all made of the same stuff, so we all have the potential to be famous.

Our solar system consists of

A few hundred billion stars, bound together by gravity.

The Sun and the eight planets, and nothing else.

The Sun and several nearby stars, as well as the planets and other objects that orbit these stars.

The Sun and all the objects that orbit it.

Sound travels at a speed of 300 meters per second. In analogy to the light-year, what does 1 sound-minute equal?

The time delay of a sound heard 300 meters away.

The distance traveled by sound in 1 minute.

The time sound takes to travel 300 meters.

The speed of sound 1 minute later.

The formation of our solar system occurred

Shortly before the age of the dinosaurs, around 250 million years ago.

When the universe formed (around 14 billion years ago).

Around 4.6 billion years ago, billions of years after the universe formed.

When the first hominids appeared around 5 million years ago.

The Sun is

An ordinary star.

Similar to other stars but much bigger and brighter.

Very different from other stars (since it is made mostly of gases).

Very different from other stars (since it generates its own light).

When we convert from kilometers to meters, we multiply by 1000 m/ 1 km. We can do this because

There are 1000 km in one meter.

Meters and kilometers are the same thing.

All conversion require that we multiply by 1000, regardless of the units.

This fraction is equal to one.

Your employer gives you a chance to decide how long your break should be. Which one should you select?

1 nanosecond.

1 centisecond.

1 kilosecond.

1 second.

Quiz 1 || Astro 5

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