A few quick questions on the scale of the universe, the cosmic microwave background and matter proportions, and how the evidence fits together. Taught in class; use this to check yourself.
The light you see from some stars left them before humans existed. How far is that, and what else tells us the universe had a beginning?
Your teacher covers scale and the extra evidence in class. These questions check the basics.
Make your prediction first. Help opens once you've locked it in.
Is it evidence for the big bang that does not depend on redshift?
Which line of evidence is it?
A self-test on the scale of the universe, the CMB and matter proportions, and how the lines of evidence fit together (AC9S10U03, nodes 1, 4 and 5, taught in class; node 5 a hinge). About 16 minutes.
Open the teacher guide: answers, solutions, slides and a worksheet.
A Quick check: a few questions on what students should know for AC9S10U03 nodes 1, 4 and 5, which you teach in class. It has no board, no clip and no new teaching, and it is optional, so it never holds up course completion. Set the width with ?width=minimum, typical (default) or wider.
Use it as a self-test after your teaching, a starter, or revision. The big bang and redshift lessons are on screen (nodes 2 and 3). A scale activity (a class-sized solar system, or a number line) and a discussion of dark matter work better in the room.
Holding the sizes in mind. When a student mixes light-years and kilometres, ask what the distance would look like in each.
Stretch: How long does light from the Sun take to reach Earth (about 8 minutes)? Use it to place one AU on a scale in light-minutes.
Support: Give the scale list on cards to order, with a unit sheet (AU, light-year).
Back in class: a model of the expanding universe (dots on a balloon); discussion of what is still unknown.