Category 1 – The Sun
This star is at the center of our Solar System.
What is the Sun?
Our Solar System belongs to this galaxy.
What is the Milky Way?
This is the name for the closest celestial body to Earth.
What is the Moon?
This scientist first proposed that the Sun, not Earth, is at the center of our Solar System.
Who was Copernicus?
Earth rotates once on its axis every this many hours.
What is 24 hours?
The Sun is mostly made of these two gases.
What are hydrogen and helium?
The Milky Way has this spiral shape and contains hundreds of billions of stars.
What is a spiral galaxy?
Put these in order from smallest to largest: Earth, Sun, Milky Way.
What is Earth → Sun → Milky Way?
This astronomer used telescopes to support Copernicus’ heliocentric model.
Who was Galileo Galilei?
When your area faces the Sun it is this time of day.
What is daytime?
This process in the Sun’s core changes hydrogen into helium and releases energy.
What is nuclear fusion?
Where are we located in the Milky Way?
We are halfway toward the Galactic Centre.
This planet is farther from Earth than the Sun and is known for its rings.
What is Saturn?
In this older model, Earth was believed to be the center of the universe.
What is the geocentric model?
If it’s 12 p.m. in Toronto, it’s about midnight in this Asian city.
What is Hong Kong?
Name two layers of the Sun that are only visible during a solar eclipse.
What are the chromosphere and corona?
At the Milky Way’s center lies this powerful object.
What is a supermassive black hole (Sagittarius A*)?
This famous deep-space photograph shows thousands of distant galaxies.
What is the Hubble Deep Field?
The visible layer of the Sun we can see from Earth is called this.
What is the photosphere?
When you move east across time zones, the time becomes this.
What is later (in the day)?
In about 5 billion years, the Sun will expand into this stage before becoming a white dwarf.
What is a red giant?
In about 4 billion years, the Milky Way will collide with this nearby galaxy.
What is the Andromeda Galaxy?
Scientists estimate there are this many galaxies in the observable universe.
What are hundreds of billions (of galaxies)?
Name all six layers of the Sun in order from the inside out.
What are the core, radiative zone, convective zone, photosphere, chromosphere, and corona?
Explain why we have time zones.
What is because Earth rotates and different parts face the Sun at different times?