Sun Moon Earth

Front

The sun is the only __________ in our solar system.

Back

star

Answer explanation

The sun is the only star in our solar system, as it is a massive ball of gas that produces light and heat through nuclear fusion. The other options, such as planet and galaxy, do not accurately describe the sun.

Front

The sun is made of what two gases?

Back

helium and hydrogen

Answer explanation

The sun is primarily composed of hydrogen (about 74%) and helium (about 24%). Therefore, the correct answer is helium and hydrogen, as the other options do not accurately represent the sun's composition.

Front

The sun is what sized star?

Back

medium

Answer explanation

The sun is classified as a medium-sized star, specifically a G-type main-sequence star (G dwarf). It is not as large as giants or supergiants, nor as small as red dwarfs, placing it in the medium category.

Front

How would you describe the moon's surface?

Back

rocky

Answer explanation

The moon's surface is primarily rocky, consisting of various types of rocks and regolith. It lacks a significant atmosphere, making it inhospitable and preventing smooth or gaseous characteristics.

Front

The moon is how big compared to earth?

Back

1/4 as big

Answer explanation

The moon's diameter is about 3,474 km, while Earth's is about 12,742 km. This means the moon is approximately 1/4 the size of Earth, making '1/4 as big' the correct choice.

Front

The moon has none of which of the following? Options: water and rocks, air and rocks, water and air, mountains or air

Back

water and air

Answer explanation

The moon has no air, which is essential for breathing, and it has very little water. Therefore, the correct answer is 'water and air', as these are absent on the moon.

Front

How do we see the moon?

Back

It reflects light from the sun

Answer explanation

We see the moon because it reflects light from the sun. The moon does not produce its own light; instead, it shines by reflecting sunlight that reaches its surface.

Front

How long does it take the moon to revolve around the earth?

Back

27 days

Answer explanation

The moon takes approximately 27 days to complete one full orbit around the Earth, known as a sidereal month. This is the correct answer, as it is significantly shorter than a year or a day.

Front

Earth's nickname

Back

Blue Planet

Answer explanation

Earth is commonly referred to as the 'Blue Planet' due to its abundant water, which covers about 71% of its surface. The other options, like 'Red Planet' and 'Orange Planet', refer to Mars and are incorrect.

Front

Earth has the only breathable __________

Back

atmosphere

Answer explanation

Earth has the only breathable atmosphere, which is essential for life. Unlike other planets, Earth's atmosphere contains the right mix of gases, primarily nitrogen and oxygen, making it unique in supporting life.