Strange Lights, Far Planets: teacher key

Aliens and UFOs, grade 3 edition, written for 3rd grade. People report strange lights in the sky, and scientists search Mars and far-off stars. Here is what each side has found.

Read the book. Print this page for the key.

Questions and answers

1. What does UFO stand for?
   • Unidentified flying object (answer)
   • Unknown fast orbit
   • Up from outside
2. Why does Mars look red?
   • It is hot
   • Rusty iron is in its ground (answer)
   • It has red oceans
3. What does a rover do on Mars?
   • Takes pictures and measurements (answer)
   • Sends people home
   • Makes rain
4. Which can sometimes look like a strange light in the sky?
   • A bright planet like Venus (answer)
   • A cloud of rust
   • A rover
5. If a person reports a UFO, what do we know for sure?
   • It was an alien ship
   • They saw something they could not identify (answer)
   • It was a meteor
6. What does exoplanet mean?
   • A planet around another star (answer)
   • A rusty rock
   • A kind of robot

Words

• rover: wheeled robot
• exoplanet: far-off planet
• identify: tell what
• meteors: shooting stars