Describe

Geocentric

Heliocentric

New planets

Milky way

Solar system

Galileo’s observations

Galileo’s conclusions

Visible light

Naked-eye

Reflecting telescope

Refracting telescope

Photography

Focal length

Converging lens

Eyepiece

Magnify

Image

Objective lens

Primary mirror

Secondary mirror

Refraction

Boundary

Real image

Virtual image

Reflection

How reflecting telescope works

How refracting telescope works

Wave

Frequency

Wavelength

Amplitude

Wave speed

Longitudinal

Transverse

Herschel’s experiment

Ritter’s experiment

Electromagnetic waves