The Asteroid of Doom: Homemade Telescopes



Rosie and her #STEMsleuths saved the world from the Asteroid of Doom. But now our planetary orbit is filled with tons of smashed asteroid bits. We have to make sure none of those chunks of rock enter our atmosphere – and to do that we need telescopes! Learn how to make your own homemade telescope, measure the magnification, and get sky charts of meteor showers to check out!

You can download our labs piecemeal here, or become a Patron to never miss out on the newest Rosie Lab mystery!




In the first two parts of our Asteroid of Doom kids optics lab we had fun saving the world while learning a little bit about using optics to bend light. Not that we obliterated the Asteroid of Doom, however, there is a TON of debris that needs to be tracked. So much that computer systems are being overloaded, and Rosie Research and her #STEMSleuth companions are ready to step in and watch the night skies. That means we need to make homemade telescopes!

In this lab we will be building simple homemade telescopes with easily sourced materials! We also have a slew of add on activities dealing with our night sky – kids will have the chance to become planetary scientists as they discover Pluto, build 3D constellations, bake up delicious constellation cookies and more!

We’re changing the download setup this month as well in a much easier and streamlined compressed folder! Just download the zipped folder and open it up for all the goodies!


What’s included:

Lab Books
There is one lab book for the third part of our trilogy, but lots of add on activities to help scale it to your child’s age and interest! Tabloid versions of the labs are also available if you want to print the labs on 11×17 paper to make each lab into it’s own folder.

Add-on Activities
Our goal is to enrich the lives of young scientists, and our add-on activities are ideas to build upon the principles and science we learn throughout the mystery. The Add-on folder is split into various grade levels with age appropriate ideas, instructions and worksheets for them! This unit’s add on activities include:

  • Constellation Cookies: Learn common constellations in this delicious activity!
  • Blinking Planets: Can you find the planets in our bouncy ball sky? It’s an extreme I Spy until you check out our blink comparator online that let’s you find it in the blink of an eye!
  • Finding Pluto: Check out the real data of Pluto’s discovery – can you find it in the night sky?
  • 3D Constellations: See just how far apart stars are as you create 3D planets!

Parent Guides
There are written parent teacher guides that will give you some quick tips and tricks to troubleshoot issues you might run into, tell you the broad takeaway from the lab, help you brainstorm questions to ask and some additional resources! Check out the Parent/Teacher video of Dr. Erica doing the lab here!

Scaling Guides
The scaling guides will help you think of ways to expand on the concepts in age appropriate activities, while the sourcing guides will help you find everything we bought for the lab!

Lastly there is our In Real Life download. This download will help you connect the concepts we work with in the labs to everyday life. It will help you guide your kids to understanding why optics is important and what the big takeaway of the lab is as well as safety precautions!

Worried about knowing the science behind the mystery?

Check out our parent teacher videos online to see the full lab as we answer a variety of questions you might have!

Homemade telescopes science curriculum


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