Catalogue of the Cosmos What's out there? Learn the difference between all sorts of astronomical objects.
Zoom Astronomy Dictionary Another site with useful definitions for "Our Place in the Universe" activity.
APOD Index Astronomy Picture of the Day index of astronomical objects by type. Click on any of the sub-headings to see images and descriptions.
The Scale of the Universe 2 Interactive How big is big? How small is small? Spend some time exploring this amazing updated version of "The Powers of 10" film from the late 1960's. What is a light-minute? light-hour? light-day? light year? What are some objects in the universe that are the size of these units of measurement?
To Scale: The Solar System What if the Earth was shrunk to the size of a marble? How big would the Sun be on this scale? How far away would it be. I turns out you'd need 7 miles to make a model of the solar system at this scale! Watch this 7 minute video and see the true scale of the solar system yourself!
Football field scale model of the Solar System: How far away is Planet 9? The scale used to create this model of the Solar System is the same as the one we used to create our Solar System model in Bulldog Stadium: 1 inch = 100,000 miles, 1 yard = 3,600,000 miles. And how far away would the newly hypothesized "Planet 9" be? Watch this video and find out.
What is Look Back Time? A star, 3000 LY distant from us, goes supernova! When are we going to see it? Try this animation for yourself. If you saw the supernova tonight, then when did the supernova occur?
How Big is Our Universe? Travel through space and time as you journey from Earth to the farthest reaches of the observable universe. Pay careful attention to each part of each web page. On you journey outward, keep in mind the questions you are to answer on the "How big is our universe? Online Activity" assignment
A billion stars imaged in detail: The entire Milky Way as seen from Earth. Use this interactive web site to view amazing details.
Our Place in the Milky Way Galaxy How far away from Earth would you travel if you went 11 light hours? How far has Voyager 1 traveled? If you went one light year from Earth, what would you encounter? Travel from the Sun to the edge of the Milky Way Galaxy and back again in this simulation.
The Known Universe Fly from the Himalaya to the edge of the observable universe in this correctly scaled video from the American Museum of Natural History.
Laniakea: Our home supercluster Our place in one of the biggest structures in the universe.
Practice Quiz/Review Questions Test your knowledge! Are you ready for the unit evaluation?