Haeun was watching a documentary about the space station when she pointed at the screen, noticing a round droplet clinging to an astronaut’s eye.
“Mom, do astronauts cry when they’re sad?”
“Of course they do. But those tears move in a completely different way than ours.”
“Different how?”
“On Earth, when tears come out, gravity pulls them straight down your face. But the space station is basically weightless, so tears can’t fall downward at all.”
“So what happens to them?”
“They just gather into a round little ball hanging right on the eye. An astronaut actually filmed this happening once and showed everyone.”
“What happens when that droplet keeps growing?”
“It keeps growing until, at some point, it breaks free from the eye and floats off into the air, like a tiny soap bubble.”
“That sounds like it would sting.”
“Actually, that really happened once. An astronaut got something in their eye during a spacewalk, and since the tears couldn’t flow away, they just kept pooling right there. In the end, the astronaut had to rub their eye against a sponge built into the helmet to finally fix it.”
“Nobody knew about this the first time someone went to space, right?”
“Right, everyone was caught completely off guard at first. Now that everyone knows, astronauts bring along tools to help catch or stop water from floating away before they even launch.”
“Wow. Does sweat do the same thing?”
“Exactly the same. Sweat doesn’t drip off either, it just sticks to your skin or clumps into little balls. That’s why the space station has special clothing and equipment just for soaking up sweat.”
“So drinking water must be different too?”
“It is, if you pour water into a cup, it just floats away. That’s why astronauts drink from special pouches with straws attached.”
“Spilling water must be a real hassle to clean up.”
“You really have to be careful. If a floating water droplet drifts into electronic equipment, it can actually break it.”
“So water just behaves strangely in space.”
“It’s not really strange, that’s actually water’s natural shape. On Earth, gravity is so strong it’s always pulling water downward, but without gravity, water naturally wants to become a perfect little ball.”
“So it’s not that we’re normal on Earth, it’s that gravity is the special one.”
“Exactly. Most of the things we take for granted are really just gravity doing its thing behind the scenes.”
Haeun gently touched her own eye, struck by how something so ordinary on Earth wasn’t ordinary at all in space.
“The space station is nearly weightless, so tears don’t fall, they cling to the eye and gather into a round floating droplet instead.”
Your Turn Now
Share with someone today what you remember.
- Why do tears fall downward on Earth?
- What happens to tears in space?
- What’s the real reason water forms round balls in space?
(Check when ready: 1. Gravity. 2. They gather into a round ball on the eye. 3. Without gravity, water naturally wants to form a perfect sphere.)
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