1.
Astronaut A person trained to travel and work in space.
2.
Orbit The path an object takes around a planet, star, or moon.
3.
Microgravity A condition in space where there is very little gravity.
4.
Immune system The body’s defense system against illness.
5.
Vaccine A medicine that helps the body fight certain diseases.
6.
Herd immunity Protection that happens when most people in a group are vaccinated.
7.
Renewable energy Energy that comes from natural sources that will not run out.
8.
Solar panel A device that changes sunlight into electricity.
9.
Silicon A material used in electronics and solar panels.
10.
Bioluminescence Light made by living things, such as some deep-sea fish.
11.
Pressure The force of something pushing against a surface.
12.
Mineral deposit A natural collection of valuable substances in the ground.
13.
Telegraph An old system of sending messages using electrical signals.
14.
Signal A message sent from one place to another.
15.
Rotary dial A round dial on older telephones for making calls.
16.
Telescope A device that makes far-away objects look closer.
17.
Exoplanet A planet outside our solar system.
18.
Galaxy A large group of stars, gas, and dust in space.
19.
Atmosphere The layer of gases around a planet.
20.
Big Bang The event scientists believe started the universe.
21.
Module A separate section of a spacecraft or space station.
22.
Boosters Extra doses of a vaccine to keep protection strong.
23.
Fossil fuels Energy sources like coal, oil, and gas.
24.
Invention A new tool, device, or method that is created.
25.
Observation The act of watching something carefully to learn from it.
