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Four Little Dots Beside Jupiter

5th grade nonfiction passage about Galileo and Jupiter's moons: 210 words, six questions, an answer key and vocabulary.

5th grade nonfiction Galileo and Jupiter's moons 210 words

Four Little Dots Beside Jupiter

In 1610, a scientist named Galileo built a telescope and pointed it at the bright planet Jupiter. Next to the planet, he noticed three tiny, bright dots in a straight line. He thought they must be faraway stars.

The next night, Galileo looked again, and the dots had moved. Stars do not shift around like that. He kept looking night after night and wrote down what he saw. Sometimes a dot was on the left of Jupiter, and sometimes it was on the right. Sometimes one dot disappeared, and then it came back. Soon there were four of them.

Galileo realized that the dots were not stars at all. They were small worlds circling Jupiter, just as our moon circles Earth. Today we call them Io, Europa, Ganymede, and Callisto, and they are known as the Galilean moons. They are so bright that people can spot them with a good pair of binoculars.

This discovery mattered because many people at the time believed that everything in the sky circled Earth. Here was proof that some objects circled another world. Galileo had found it with careful notes and plenty of patience. His story reminds us that a big idea can begin with something as small as a dot of light that moves.

Questions

  1. What did Galileo point his telescope at in 1610? in the text

  2. What did Galileo first think the dots were? in the text

  3. What showed him that the dots were not stars? think about it

  4. How many moons did Galileo find in all? in the text

  5. Why did the discovery matter? think about it

  6. How did Galileo make his discovery? in the text

Words to know

telescope
a tool that makes faraway things look closer
planet
a large round world that travels around a star
realized
suddenly understood something
discovery
something found or learned for the first time
proof
facts that show something is true
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One passage, three levels

The same topic and facts written three ways, so a mixed class can read and talk about one text. Each group’s sheet shows only a shape; the key says which is which.

● Easier · 161 words · Flesch-Kincaid grade 3.9

In 1610, a scientist named Galileo built a telescope. He pointed it at the bright planet Jupiter. Next to the planet, he saw three tiny, bright dots in a line. He thought they were faraway stars.

The next night, he looked again. The dots had moved. Stars do not move like that. He kept looking night after night and wrote down what he saw. Sometimes a dot was left of Jupiter. Sometimes it was right. Sometimes a dot went away and then came back. Soon there were four dots.

Galileo realized the dots were not stars. They were small worlds circling Jupiter, like our moon circles Earth. Today we call them Io, Europa, Ganymede, and Callisto. They are called the Galilean moons. You can see them with a good pair of binoculars.

This discovery mattered. Many people then thought everything in the sky circled Earth. Here was proof that some things circled another world. Galileo found it with careful notes and patience.

▲ This passage · 210 words · Flesch-Kincaid grade 5.6

In 1610, a scientist named Galileo built a telescope and pointed it at the bright planet Jupiter. Next to the planet, he noticed three tiny, bright dots in a straight line. He thought they must be faraway stars.

The next night, Galileo looked again, and the dots had moved. Stars do not shift around like that. He kept looking night after night and wrote down what he saw. Sometimes a dot was on the left of Jupiter, and sometimes it was on the right. Sometimes one dot disappeared, and then it came back. Soon there were four of them.

Galileo realized that the dots were not stars at all. They were small worlds circling Jupiter, just as our moon circles Earth. Today we call them Io, Europa, Ganymede, and Callisto, and they are known as the Galilean moons. They are so bright that people can spot them with a good pair of binoculars.

This discovery mattered because many people at the time believed that everything in the sky circled Earth. Here was proof that some objects circled another world. Galileo had found it with careful notes and plenty of patience. His story reminds us that a big idea can begin with something as small as a dot of light that moves.

■ Harder · 216 words · Flesch-Kincaid grade 8.3

In 1610, a scientist named Galileo constructed a telescope and aimed it at the brilliant planet Jupiter. Beside the planet, he noticed three tiny, bright dots arranged in a straight line, and he assumed that they were distant stars.

The following night, when Galileo looked again, the dots had changed position. Stars do not wander about in that manner. He continued to observe night after night and recorded everything he saw. Sometimes a dot appeared to the left of Jupiter, and sometimes to the right. Occasionally one of the dots vanished, only to reappear later. Eventually, there were four of them.

Galileo came to understand that the dots were not stars at all. They were small worlds circling Jupiter, just as our own moon circles Earth. Today we call them Io, Europa, Ganymede, and Callisto, and they are known collectively as the Galilean moons. They are bright enough that people can spot them with a good pair of binoculars.

This discovery was important because many people at the time believed that everything in the sky revolved around Earth. Here was clear evidence that some objects circled another world. Galileo uncovered it through careful notes and remarkable patience. His story reminds us that a great idea can begin with something as small as a moving dot of light.

Download as one PDF

How to use it

  1. Press Read it big (or B) to put the text on the projector, or Full screen (F) to fill the whole screen.
  2. Ask the questions one at a time and use Show answer when the class has decided. A shows or hides every answer.
  3. Print student copy for the class, or Print with answers for yourself.

Ideas for class

  • Before reading, put telescope, planet, realized, discovery and proof on the board with their meanings from the Words to know section and have students predict what the text will be about.
  • Read it aloud once while students follow along, then have them reread it alone or with a partner. At a calm 100 words a minute it takes about 2 minutes to read aloud.
  • Use the Read it big button (or B) to put the text on the projector, and Show answer on one question at a time so the class commits to an answer first.
  • Question 3 asks the reader to infer. Ask students to point to the words in the passage that led them to their answer.
  • Ask students to write one question the passage did not answer, then look for the answer in a book or on a classroom screen.
  • Print the student copy for independent work and keep the answer-key copy for yourself.

Related

Questions

What reading level is "Four Little Dots Beside Jupiter"?

It was written for 5th grade. It has 210 words and works out to a Flesch-Kincaid grade level of about 5.6. That is a formula's estimate from sentence length and syllables, and it is not a Lexile or a guided reading level, so check it against your students.

What do the questions ask?

There are six. 4 ask for something the text says directly and 2 ask the reader to work something out from clues. Each has an answer in the key, and the answers are written as a teacher would accept them, not as the only possible wording.

How long does it take to read?

About 2 minutes read aloud at 100 words a minute. For a one-minute fluency check, paste it into the fluency timer and use the word count.

Can I print it?

Yes. Print student copy gives the passage, the questions with lines to write on, and the word meanings. Print with answers gives the same page with the answers filled in. Both are made in your browser.

Is this passage from a published book?

No. It was written for Peabody Teach, so there is no book to buy and no login to read it.

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