![The rocky planets](/sites/default/files/styles/resource_card_image_360x300_/public/2019-11/Rocky_planets.jpg?itok=5IsUrgOh)
The Inner Solar System
STEM Explained
Earth is covered in rocks. So are Mercury, Venus, Mars and the Moon. Does that mean the rocky planets are all the same?
![Milky Way galaxy as seen from Australia (Brett Ritchie via Unsplash)](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/Milky%20Way%20galaxy%20as%20seen%20from%20Australia.jpg?itok=OevuZWGV)
The Milky Way
STEM Explained
In 2019, scientists discovered that our galaxy, the Milky Way, is not the shape they thought it was. How do astronomers use astronomical distance to understand the shapes of galaxies?
![Hot sunrise in space](/sites/default/files/styles/resource_card_image_360x300_/public/2019-12/Temp_earth_ISS.jpg?itok=7Z9ztMhn)
Temperature: On Earth and on the Space Station
Backgrounders
This backgrounder explains what temperature is, how it is measured, how it affects people, and how it is controlled on the International Space Station.
![Full moon](/sites/default/files/styles/resource_card_image_360x300_/public/2019-12/full-moon.jpg?itok=NubbtzMy)
Moon: Phases
Picture Collections
8 images of different lunar phases showing the portion of the Moon lit by the Sun as the Moon orbits the Earth and as seen by us on Earth
![Condensation on a window pane](/sites/default/files/styles/resource_card_image_360x300_/public/2019-12/Condensation_on_window_pane.jpg?itok=ldU_Rpxp)
Humidity on Earth and on the Space Station
Backgrounders
Humidity is an important part of life on Earth and life in space. This backgrounder explains what humidity is, how it is measured and how it affects us both mentally and physically.
![compass pointing north](/sites/default/files/2020-04/compass-pointing-to-north.jpg)
How can I tell which way is north at night?
Hands-on Activities
Do you like to look at the stars? What can you identify in the night sky? Try finding some important constellations tonight!
![Canadian pilot](/sites/default/files/styles/resource_card_image_360x300_/public/2019-09/Canadian_fighter_pilot.jpg?itok=kQa9KXBd)
From Sky to Space
STEM Explained
Canadian astronauts Jeremy Hansen and David Saint-Jacques explain how learning to fly an aircraft prepared them for the challenges of living in space.
![Robert Thirsk | Former CSA Astronaut Robert Thirsk | Ancien astronaute de l’Agence spatiale canadienne](/sites/default/files/styles/career_image/public/4430_13.jpg?itok=2kqfoV2V)
Robert Thirsk
Career Profiles
Former CSA Astronaut