The Journey Museum and Learning Center in partnership with the South Dakota Space Grant Consortium present episode 4 of Space Crew Jr. In this episode Alex and Macy return for some fun experiments that can be done at home. Experiments include Universal Slime, an Egg Drop and more. A full list of items needed can be found below or at journeymuseum.org

Stretchy Universe Slime (https://spaceplace.nasa.gov/universes...)
a. Context: Ever since the Universe was created about 13.8 billion years
ago, it has been constantly expanding in every direction. Even now,
we can see from deep-space telescopes that galaxies are moving
away from us. This slime will simulate galaxies spreading apart as the
slime conforms to a flat surface and is fun to play with!
b. Materials:
i. Clear School Glue
ii. Borax (1 teaspoon)
iii. Water
iv. Red and Blue Food coloring
v. Two bowls
vi. Measuring Cups: ½ cup and 1 cup
vii. Wax paper
viii. Light-colored glitter (white or silver)
c. Directions: (Given in above URL)

Bernoulli’s Balloon Experiment:
Background Information:
Daniel Bernoulli was a Swiss mathematician and physicist who lived during the 18th century. His
most famous work, named bernoulli's principle, is what we will be demonstrating in this
experiment. The Bernoulli Principle was based on the law of conservation of energy and
Newton’s second law of motion.
Supplies:
● String or rope
● Balloons
● Hair dryer
● Paper towel roll
Instructions:
1. First, set up a system for the two balloons to hang from, this could be a meter stick
between two tables or other objects or this could be hanging from a ceiling or balcony.
As long as the balloons are hanging from a level surface, it should work.
2. Blow up the balloons to be the same size and tie the same length of rope or string to
each balloon.
3. Hang the balloons from your system using the string or rope and make sure they level
with each other, this will not work if one is hanging lower or higher than the other.
4. The balloons should be close to each other but not touching, there should be roughly 4-6
inches between the balloons.
5. Start by blowing air between the balloons and see what happens, if nothing happens that
is ok
6. Next, use the paper towel roll to blow between the balloons, they should start to pull
together (instead of blowing apart like you might expect)
7. Lastly, try using the hair dryer and blowing air in between the balloons with that, they
should definitely pull together using this method.
Why is this happening?
The balloons are being pulled because of a difference in pressure when you blow air in between
them. In between the balloons we’ve created a low pressure zone and the balloons have high
pressure around them, keeping their shape. The change in high pressure to low pressure pulls
the balloons in and towards each other.

Egg Drop Experiment:
We all know that an egg will break if we exert enough force on it. This is especially true when we
drop an egg from a high place, because the Force of the impact is strong enough to break the
egg’s shell. Is there any way we could stop this force from exerting on the egg and stop it from
breaking open? Well, we could drop it onto a softer surface, lessening the impact force. But,
what if we could build a machine that could stop an egg from breaking, without having to create
a soft landing surface?
There are many different supplies that could be used to create an egg drop apparatus, the
following are some common examples:
● Balloons
● String
● Paper/styrofoam cups
● Sponges
● Cotton balls
● Straws
● Cardboard
Instructions:
1. Build your apparatus! Find what materials you want to use and build something around
your egg to slow down its fall or soften its landing.
2. Drop your egg! You can either drop it off of a high place (safely!) or have an adult drop it
off of a ladder.
3. If your egg broke, try adjusting your apparatus to fix it or try building a new one!

Elephant’s Toothpaste:
Background: This explosive experiment is an easy way to show the decomposition of hydrogen
peroxide. Potassium Iodide, otherwise known as yeast, causes the hydrogen and oxygen to
break apart and the oxygen forms lots and lots of small bubbles (from the dish soap) very
rapidly, causing the big explosion of elephant’s toothpaste!
Supplies:
● 2-Litre bottle
● 2 cups of 6% hydrogen Peroxide liquid
● ¼ cup of dry yeast
● ¾ cup warm water
● ¼ cup dish soap
● Food coloring
● Small cup
● Safety gear
Instructions:
1. First, make sure your hands and eyes are protected, as this is a chemical reaction. Wear
gloves and safety goggles when handling the ingredients.
2. Have an adult carefully pour the hydrogen peroxide into the 2L bottle. Then, add food
coloring and the dish soap into the bottle and swish it around to mix up the ingredients.
3. In your small cup, mix the yeast and warm water, stirring for at least 30 seconds to make
sure the yeast has activated.
4. Pour the yeast and water mixture into the 2L bottle and watch the reaction!