ACE Science – Unit 3 Study Guide: Space & The Universe

Maya, Aiden, and Olivia are having a debate in science class. They want to know: What is the Big Bang Theory all about?

• the origin and expansion of the universe from a single point

• the formation of the solar system

• the evolution of life on Earth

• the end of the universe

Answer explanation

The Big Bang Theory explains the origin and expansion of the universe from a single point, marking the beginning of time and space, rather than focusing on the solar system, life on Earth, or the universe's end.

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Henry, Olivia, and Arjun are stargazing and wondering how scientists know the universe is expanding. What amazing evidence do they discover?

• galaxies are moving away from us, as shown by redshift in their light

• the temperature of the universe is increasing

• stars are getting brighter over time

• the number of galaxies is decreasing

Answer explanation

The correct evidence for the universe's expansion is that galaxies are moving away from us, indicated by redshift in their light. This phenomenon shows that as light travels from distant galaxies, it shifts to longer wavelengths, confirming expansion.

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Liam, Arjun, and Samuel are stargazing one night when they notice something interesting: the light from distant galaxies looks a bit redder than expected! What does this red shift tell our curious friends?

• stars and galaxies are moving away from us.

• stars and galaxies are getting closer to us.

• stars and galaxies are not moving at all.

• stars and galaxies are changing color due to temperature.

Answer explanation

The red shift indicates that the light from distant galaxies is stretched, which means they are moving away from us. This phenomenon supports the idea of an expanding universe.

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Maya, Elijah, and Mason are curious about how the Sun helps life on Earth. Which of the following is the main way the Sun supports life?

• providing energy for plants to make food

• removing oxygen from the atmosphere

• blocking all sunlight from reaching Earth

• causing all water to freeze

Answer explanation

The Sun provides energy for photosynthesis, allowing plants to make food, which is essential for life on Earth. The other options do not support life.

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Liam, Abigail, and Daniel are stargazing and wonder: What invisible force connects the Moon and Earth?

• gravity

• lightning

• sound waves

• magnetism

Answer explanation

The invisible force that connects the Moon and Earth is gravity. It is the force that attracts two bodies towards each other, keeping the Moon in orbit around the Earth.

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Oliver, Scarlett, and Aria are planning a space adventure! Help them by selecting the correct order of planets from the Sun so they can visit each one in the right sequence.

• Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

• Venus, Mercury, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

• Mercury, Earth, Venus, Mars, Jupiter, Saturn, Uranus, Neptune

• Mercury, Venus, Mars, Earth, Jupiter, Saturn, Uranus, Neptune

Answer explanation

The correct order of planets from the Sun is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. This sequence follows their distance from the Sun, making the first answer choice the right one.

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Benjamin and Charlotte are having a friendly debate about planets! Can you help them out? Select the statement that correctly describes a difference between gas planets and rocky planets.

• Gas planets are mostly made of hydrogen and helium, while rocky planets have solid surfaces.

• Gas planets have solid surfaces, while rocky planets are made mostly of gas.

• Both gas planets and rocky planets are made entirely of metal.

• Rocky planets are larger than gas planets.

Answer explanation

Gas planets are primarily composed of hydrogen and helium, lacking solid surfaces, while rocky planets have solid surfaces made of minerals and metals. This distinction is key in understanding their differences.

Oliver, Rohan, and Benjamin are having a debate about Pluto. Some scientists call Pluto a dwarf planet because:

• it does not clear its orbit of other debris.

• it is the smallest planet in the solar system.

• it is farther from the Sun than Neptune.

• it has no moons.

Answer explanation

Pluto is classified as a dwarf planet because it does not clear its orbit of other debris, meaning it shares its orbital zone with other objects, which is a key criterion for full planet status.

When you were designing your planet for the class planet painting project, what sparked your creativity just like Ava, Noah, and Grace?

• your imagination and creativity

• the teacher's favorite planet

• a famous movie planet

• a random color choice

Answer explanation

The correct choice, 'your imagination and creativity', emphasizes the personal inspiration that drives artistic expression, similar to how Ava, Noah, and Grace found their creative sparks.

Priya, Ava, and Daniel are stargazing and wondering: How do planets actually move in space?

• They orbit around stars in a path called an orbit.

• They remain completely stationary.

• They move in straight lines away from each other.

• They randomly bounce around in space.

Answer explanation

Planets move in space by orbiting around stars, following a curved path known as an orbit. This is due to the gravitational pull of the star, which keeps the planets in a stable path rather than moving randomly or remaining stationary.

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