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E. Earth and Space Science: Space Exploration · Space Exploration: The Sun, the Solar System and the Universe

Space Exploration: The Sun, the Solar System and the Universe: Unit Review

A1.1 A1.2 A1.3 A1.4 A1.5 A2.1 A2.2 A2.3 A2.4 A2.5 E1.1 E1.2 E1.3 E2.1 E2.2 E2.3 E2.4 E2.5 E2.6About 40 minutes
Learning goals
  • I can describe the Sun, the solar system, stars, galaxies and the structure of the universe.
  • I can quantify distances and sizes in space using appropriate units and scale models.
  • I can summarize evidence for the origin and evolution of the solar system and the universe, considering diverse ways of knowing.
  • I can explain sky phenomena I can observe from Earth.
  • I can evaluate the impacts and benefits of space exploration and technology.

Words to know

astronomical unit (AU)
The average Earth–Sun distance, about 1.5 × 10⁸ km.
light-year
The distance light travels in a year, about 9.46 × 10¹² km.
nuclear fusion
Joining small nuclei into larger ones, releasing energy; it powers stars.
redshift
A shift of spectral lines toward red, showing an object is moving away.
remote sensing
Gathering information about Earth from a distance, for example by satellite.
space debris
Human-made objects in orbit that no longer serve a purpose.

Let's review!

In this unit you studied the Sun (its structure, fusion, and how its energy drives winds, the water cycle, auroras and renewable energy), the members of the solar system, stars and galaxies, how to measure and model huge distances, the evidence for how the solar system and universe began (including diverse ways of knowing the sky), the causes of sky events you can observe, and the impacts and benefits of space exploration and technology.

This review has a few questions from every lesson. Try each one, then press Show answer to check.

Observable universeGalaxy clusters and superclustersLocal Group (dozens of galaxies)Milky Way GalaxySolar systemEarth
Our cosmic address: you studied every level of this picture in this unit.
SunSolar panelslight → electricitySolar heatinglight → heatWinduneven heating → windHydroelectricwater cycle → riversBiomassphotosynthesis → fuelelectricity and heat for homes, schools and industry
The Sun's energy drives wind, the water cycle and photosynthesis, which become renewable energy sources.

The Sun: Our Star

1

Name the layer of the Sun where fusion happens, and the layer we see as its surface.

2

In fusion, 4 hydrogen nuclei become 1 helium nucleus. Where does the energy come from?

3

Give two reasons the Sun is essential for life on Earth.

How the Sun Powers Earth's Weather, Water and Lights

1

Why does uneven heating cause wind?

2

What two things are needed, besides charged particles from the Sun, to produce an aurora?

3

What happened to Hydro-Québec's power grid on March 13, 1989?

From Sunlight to Electricity: The Sun and Renewable Energy

1

Which of these come from the Sun's energy: wind, tidal, hydroelectric, geothermal, biomass?

2

A 500 W panel works at full power for 3 hours. How much energy does it make?

3

A panel receives 1000 W and delivers 220 W. What is its efficiency?

Comparing the Members of the Solar System

1

Why is Eris a dwarf planet?

2

Compare the densities of the inner and outer planets and explain the difference.

3

Using T² = a³, find the period of an object at 9 AU.

Measuring Space: Kilometres, AU and Light-Years

1

Write 228 000 000 km in scientific notation.

2

How long does light take to travel 3 AU? (1 AU takes 8.3 min)

3

Convert 2.0 light-years to km (1 ly ≈ 9.46 × 10¹² km).

4

Explain why a light-year is a distance.

Building Scale Models of the Solar System and Beyond

1

At 1 cm : 100 000 km, how big is Uranus (51 118 km)?

2

At 1 cm : 1 000 000 km, how far from the Sun is Saturn (1.43 × 10⁹ km)?

3

Why are most solar system pictures not to scale?

Stars: Brightness, Colour and Life Cycles

1

Two stars look equally bright, but Star A is much farther away. Which is more luminous?

2

Where are red giants on an H–R diagram, and why?

3

Describe the end of a star 25 times the Sun's mass.

Galaxies and the Structure of the Universe

1

Describe the Milky Way's shape and size.

2

Put in order from smallest to largest: Local Group, Milky Way, solar system, supercluster.

3

What is the evidence for dark matter?

Just for fun

Review riddle: What is an astronaut's favourite part of a computer keyboard?

The space bar.

Where Did the Solar System Come From? Evidence and Models

1

Name two of Galileo's observations that supported the heliocentric model.

2

Why did giant planets form farther from the Sun?

3

Give two pieces of evidence for the nebular theory.

The Big Bang: Evidence for an Expanding Universe

1

What does it mean if a galaxy's spectral lines are shifted toward red?

2

State the three main pieces of evidence for the Big Bang.

3

Galaxy M is 4 times as far as Galaxy N. How do their speeds away from us compare?

Many Ways of Knowing the Sky

1

What is Two-Eyed Seeing?

2

Why does the Big Dipper's evening position change from season to season?

3

Give one respectful practice when sharing an Indigenous star story.

Investigating the Seasons and the Sun's Path

1

Find the noon altitude of the Sun in Sudbury (46.5° N) on June 21.

2

Why is winter sunlight weaker?

3

In a fair test of light angle and warming, name the independent and dependent variables.

Investigating the Moon, Eclipses, Tides and Meteor Showers

1

What phase is the Moon about 2 weeks after new moon?

2

Why is there not a lunar eclipse every full moon?

3

What are neap tides?

Watching Earth from Space: Climate Change and Natural Disasters

1

Which orbit is best for watching a hurricane continuously, and why?

2

Why can radar satellites map floods at night through clouds?

3

Give one limitation of satellite data.

Space Technology on Earth: Innovations and Sustainability

1

Name a medical technology connected to Canada's space robotics.

2

A GPS signal takes 0.067 s to arrive. How far away is the satellite?

3

How does precision agriculture support sustainability?

Is It Worth It? Evaluating the Impacts of Space Exploration

1

Classify: rocket exhaust in the upper atmosphere.

2

Explain the Kessler syndrome.

3

Name a stakeholder who might oppose a new mega-constellation and one who might support it.

How to use this review

  • Do one lesson's questions at a time, then check your answers.
  • If you miss two or more in a set, reread that lesson's explanation and worked examples, then try its More practice questions.
  • For calculation questions, write the formula and the units at every step.
  • For evaluation questions, always give both sides and evidence.
  • Finish with the quiz below and aim for 8 out of 10 or better.
Check your understanding

Quiz

1.

What powers the Sun?

2.

Which renewable energy source does NOT come from the Sun?

3.

Which object is a dwarf planet?

4.

Light from Neptune's distance (30 AU) takes about:

5.

A star in the bottom-left of the H–R diagram is:

6.

Which is evidence for the Big Bang?

7.

Why do we have seasons?

8.

Why are eclipses rare?

9.

Which satellite sensor can see through clouds at night?

10.

Which is an environmental negative impact of space exploration?

For parents and teachers

How to use the review results:

  • Mixing up the Sun's layers, or saying the Sun 'burns' → revisit The Sun: Our Star.
  • Can't explain wind, lake breezes or auroras → revisit How the Sun Powers Earth's Weather, Water and Lights.
  • Unsure which energy sources come from the Sun, or W vs kWh errors → revisit From Sunlight to Electricity.
  • Confusing planets, dwarf planets and moons, or density patterns → revisit Comparing the Members of the Solar System.
  • Scientific notation or unit-conversion mistakes → revisit Measuring Space: Kilometres, AU and Light-Years.
  • Multiplying instead of dividing by a scale → revisit Building Scale Models.
  • Confusing brightness with luminosity, or star life-cycle mix-ups → revisit Stars: Brightness, Colour and Life Cycles.
  • Galaxy types or the order of structures → revisit Galaxies and the Structure of the Universe.
  • Can't give evidence for the nebular theory or the heliocentric model → revisit Where Did the Solar System Come From?
  • Mixing up the Big Bang evidence or redshift → revisit The Big Bang: Evidence for an Expanding Universe.
  • Generalizing about Indigenous knowledge, or rotation vs revolution → revisit Many Ways of Knowing the Sky.
  • The 'distance causes seasons' idea, or noon-altitude errors → revisit Investigating the Seasons and the Sun's Path.
  • Phases, eclipses or tides confusion → revisit Investigating the Moon, Eclipses, Tides and Meteor Showers.
  • Choosing the wrong orbit or sensor → revisit Watching Earth from Space.
  • Spinoff myths or GPS calculations → revisit Space Technology on Earth.
  • One-sided evaluations without evidence → revisit Is It Worth It? Evaluating the Impacts of Space Exploration.

This unit connects to the other SNC1W strands: renewable energy links to the Electricity unit, climate monitoring links to the Biology unit on ecosystems and climate change, and spectra connect to the study of atoms and elements. In Grade 10 science, the Earth and space science strand continues with climate change.