Space Observer

Space Observer A Notebook filled with galaxies, black holes, forgotten physics, and the quiet stories of the universe ✨🌌

Space • Astronomy • Science • Cosmos

09/28/2026

💧 Why Does Water Flow Upward Inside A Diving Airplane?

Gravity does not switch off inside the cockpit, and it does not change at all. What changes is how the aircraft itself is moving. When a pilot pushes the nose over into a steep dive, the plane accelerates downward, and if that downward acceleration matches gravity, everything inside falls at the same rate as the aircraft. Nothing pushes against the cabin floor anymore, so water and objects float freely.

Push the maneuver harder, so the plane accelerates downward faster than gravity alone would pull it, and the effect flips. The cabin now drops away faster than the water can fall, so relative to the cockpit, the water appears to rise toward the ceiling and flow "from the bottom up." This is called negative g.

The same principle powers parabolic flights, where aircraft fly repeated arcs to create about 20 to 25 seconds of weightlessness per arc. Space agencies use these flights to train astronauts and test experiments before they go to orbit.

Inside the cabin it looks like gravity vanished, but Earth's pull is still there. The plane is simply falling right along with everything inside it.

Did you know parabolic flights give only about 20 to 25 seconds of weightlessness per arc 💧

09/27/2026

🎈 A Physics Teacher Demonstrates Bernoulli's Principle Using Nothing But A Balloon

When you seal your mouth completely around a balloon's opening and blow directly into it, you meet real resistance, since your breath has to compress the air already trapped inside. That resistance is exactly why inflating a balloon that way often feels harder than expected.

Step back slightly and blow from a short distance instead, and something counterintuitive happens, the balloon inflates more easily. This comes down to Bernoulli's principle, which states that as the speed of a moving fluid increases, its pressure decreases. Blowing from a distance creates a fast moving stream of air, and that fast airflow creates a region of lower pressure around the balloon's opening.

That pressure difference does the real work. Surrounding air gets pulled into the low pressure zone created by the fast airflow, effectively assisting the balloon's inflation rather than fighting against trapped, compressed air inside it.

This same principle explains far more than party tricks. It is the reason airplane wings generate lift, why shower curtains get pulled inward during a hot shower, and why fast moving air around a car's body affects its stability at high speeds.

Did you know Bernoulli's principle is also why shower curtains get pulled inward during a hot shower 🎈

09/27/2026

🥤 The Ocean Crushed This Can Without Ever Touching It

A sealed, empty can is lowered into the sea, and nothing physical touches it, no force, no impact, yet it crumples like paper before reaching even 30 meters down. What you are watching is pure hydrostatic pressure at work.

At the surface, pressure inside and outside the can are equal, both sitting at 1 atmosphere. But water pressure increases by roughly 1 atmosphere every 10 meters of depth, meaning the water pushing on the can's outer walls grows steadily stronger while the air trapped inside stays at its original pressure, unable to equalize.

By 10 meters down, outside pressure is already double what's inside, and the aluminum walls begin to buckle. The trapped air inside compresses according to Boyle's Law, which states that pressure and volume are inversely related for a fixed amount of gas. By 20 to 30 meters, outside pressure reaches 3 to 4 times the internal pressure, more than the can's structure can withstand, and it implodes instantly, releasing trapped air as a burst of bubbles.

This exact principle is why submarines and deep-sea vessels require extremely thick, reinforced hulls, engineered specifically to withstand pressure that becomes crushing at depth, even though it remains completely invisible and unfelt from the surface.

Did you know water pressure increases by about 1 atmosphere for every 10 meters you descend 🥤

Address

125 Maple Street
Brooklyn
11201

Website

Alerts

Be the first to know and let us send you an email when Space Observer posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Shortcuts

Share