Additional Resources
- Stellarium: “Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.”
- Astronomy Picture of the Day– Learn about astronomy through images.
- “A Private Universe” streaming video from the Annenberg Foundation – Misconceptions about the seasons are common, even among Harvard graduates.
- How many stars outside our solar system have planets around them? – Check NASA’s latest count!
- Time Lapse Sky Shows Earth Rotating – APOD 6/1/11
- Geocentric model: retrograde motion – Planet moves on epicycle; center of epicycle orbits around Earth.
- Heliocentric system: retrograde motion – Outer planet appears to move backward when inner planet overtakes it.
- Our Amazing Solar System – Introduction to Birth of our Solar System
- Moon-size object smashes into Mercury-size object – NASA simulation
- National Geographic’s “Birth of the Solar System” and Universe – The history of our Universe in 3 minutes