![Martina Bona](/sites/default/files/styles/career_image/public/2020-05/Martina%20Bona.jpg?itok=ZQ49gAeG)
Martina Bona
Career Profiles
Process Discipline Specialist
![Casting hot iron](/sites/default/files/styles/resource_card_image_360x300_/public/2020-04/casting_hot_iron.jpg?itok=mE6eP_bv)
What Causes Hot Things to Glow?
STEM Explained
Getting electrons excited by heat can cause certain materials to give off visible light when heated - like filaments in light bulbs.
Krysten Rutherford
Career Profiles
PhD Candidate, Oceanography
![Hubble Space Telescope as seen during a servicing mission in 2009](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/hubble_space_telescope.jpg?itok=eNoDBFx5)
Airborne & Space Telescopes
Backgrounders
Learn about telescopes that do their work high in Earth’s atmosphere and in space.
![Abstract light pattern](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/abstract_light.jpg?itok=MKGdyhIT)
Light and Its Properties
Backgrounders
Learn about light and its properties.
![Large diamond refracting light](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/big-round-cut-diamond.jpg?itok=KF0PkwqM)
Reflection and Refraction
Backgrounders
Learn about reflection and refraction and meet Emily Altiere, a PhD student in physics who studies lasers.
![Eyeglasses and a visual test chart](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/eyeglasses-on-visual-test-chart.jpg?itok=YSJ1M3Ow)
How We See
Backgrounders
Learn about how human vision works as well as some common types of vision problems.
![Boy looking through telescope at night](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/telescope-boy-night.jpg?itok=13zWe-Od)
Optical Telescopes
Backgrounders
Learn about the history of telescopes and the function of refracting and reflecting optical telescopes.
![Radio Telescope array at night](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/radio-telescope-at-night.jpg?itok=Xj9MDhpb)
Radio Astronomy
Backgrounders
Learn about radio astronomy, a type of astronomy that studies objects in space using radio waves and radio telescopes.
![Close-up of the Arecibo Observatory radio telescope](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/close-up_arecibo-observatory.jpg?itok=CTR21nm6)
SETI - The Search for extraterrestrial Intelligence
Backgrounders
Some astronomers are not looking for stars, planets or galaxies. They are searching for intelligent life in the universe beyond our planet.
![hermographic image a woman’s head and neck](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/woman_thermographic_image.jpg?itok=a3KKwvMC)
Thermal Imaging
Backgrounders
Learn about uses of thermal imaging as a medical imaging technology.
![dental x-ray](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/dental_x-ray.jpg?itok=wjovCVYk)
Radiography & X-ray Imaging
Backgrounders
Learn about radiography and x-rays as a form of medical imaging technology.
![Ophthalmic imaging equipment](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/digital_optical-instruments.jpg?itok=M4T6iHWy)
Ophthalmic Imaging
Backgrounders
Learn about the history, function, uses, benefits and risks of ophthalmic imaging as a medical imaging technology.
![Colour-enhanced MRI of brain and eyes](/sites/default/files/styles/resource_card_image_360x300_/public/2020-02/mri-brain_and_eyes.jpg?itok=nvD1FxxQ)
Magnetic Resonance Imaging
Backgrounders
Learn about the history, function, uses, benefits and risks of Magnetic Resonance Imaging (MRI) as a medical imaging technology.