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The Sun by Day, the Moon and Stars by Night · The Sun is in the daytime sky; the Moon and stars are most easily seen at night. · 1-ESS1-1

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The Sun by Day, the Moon and Stars by Night

with Lumi

Lumi the friendly glowing firefly perches on a windowsill, one wing stretched toward a bright yellow Sun shining in a wide blue sky outside, while a Moon and tiny stars peek through the dark upper corner of the same window.

Name the Sun as the sky object we always see during the day.
Name the Moon and stars as sky objects most easily seen at night.
Match each sky object to the time of day when it is easiest to spot.
Tell why stars are hard to see in the daytime even though they are still there.

Key terms

daytime: The bright part of the day when the Sun is up and the sky looks blue.
night: The dark part of the day after the Sun goes down, when we can see the Moon and stars.
Sun: The bright star in our daytime sky that gives Earth light and warmth.
Moon: Earth's rocky neighbor that we usually see glowing softly in the night sky.
star: A point of light in the sky that is really a huge faraway ball of glowing gas.

Why the Day Sky Is Bright

During the daytime, the Sun is high in the sky and shines its strong light all around us. That light scatters through the air and makes the whole sky look bright and blue. Because everything is lit up, we can see grass, trees, and people easily. The Sun is so bright that we should never look straight at it, since it can hurt our eyes.

Why Stars Hide in the Day

Stars do not switch off when morning comes. They are still shining the whole time, even in the daytime. The reason we cannot see them is that the Sun makes the sky so bright that their tiny light gets washed out. Think of a small candle in a room with all the lights on. The candle is still burning, but it is hard to spot until the big lights go off, just like the stars at night.

Worked examples

Decide where a tiny twinkling star belongs.

Ask yourself: is a star easiest to see when the sky is bright or dark?
Stars get washed out by the bright daytime sky, so they show best in the dark.
Sort the star into the night box.

Answer: The star goes in the night box, because stars are easiest to see at night.

Tell whether stars disappear during the day.

Remember that stars keep shining all the time, day and night.
In the daytime the bright sky simply hides their light.
So the stars are still there, just hidden by sunlight.

Answer: No — stars do not disappear; the bright daytime sky just hides them.

Hi, I am Lumi! Let us look up at the sky together. In the daytime the sky is bright and light blue. The big, bright Sun is up there every single day. The Sun gives us light so we can see outside. We do not look right at the Sun — it is far too bright for our eyes. When the Sun goes down, the sky gets dark. Now it is night. At night we can see the Moon. The Moon looks like a soft white circle or a curved sliver. We can also see stars. Stars are points of light that shine in the dark sky. Here is a cool secret: stars are actually up there in the daytime too! But the Sun makes the sky so bright that the stars are hiding — like candles in a brightly lit room. At night, when the sky turns dark, the stars can finally shine through. So the easy rule is: the Sun is easiest to spot in the day; the Moon and stars are easiest to spot at night. Not sure which sky you are looking at? Just ask: Is the sky bright or dark?

Activity

Sort each sky picture into the day box or the night box.

Practice

Look out a window and decide if it is day or night by the sky brightness.

Name two things you usually see in the night sky after the Sun sets.

Common mistakes to avoid

Stars fall down and vanish each morning.Stars stay in the sky all day; the bright sunlight just hides them from view.
The Sun is in the sky at night too.At night the Sun has set below the horizon, so it is not in the night sky.

Check your understanding

What do we see in the sky in the daytime?

What two things are easiest to see in the sky at night?

Lia says the stars are gone in the daytime. Is that right?

Recap

In the daytime the Sun lights up the sky and makes it bright and blue, while at night the dark sky lets us see the Moon and stars. Stars never really leave; the bright daytime sky simply hides them, the same way a candle is hard to see in a brightly lit room.

Reflect

What is your favorite thing to look for in the sky, and is it a day or night thing?