Astronaut Reveals: My heart Shrinks & More Shocking Challenges | Shubhanshu Shukla | FO536 Raj Shamani
July 16, 2026
AI Summary
5 min readWhen Shubhanshu Shukla, a fighter pilot turned astronaut, first saw India from the International Space Station on a night pass, he felt tears well up. He instinctively wiped his eyes, but in microgravity, tears don't fall—they just pool. "I started doing this, you know, wiping all dry, nothing," he recalls. That moment, passing over a fully lit Indian peninsula in under a minute, became the emotional anchor of a conversation that otherwise stays firmly grounded in the mechanics of how spaceflight actually works.
What Happens to a Human Body in Space
The body's response to microgravity is immediate and dramatic. Within minutes of reaching orbit, blood that gravity normally keeps in the legs shifts upward into the head, causing the face to swell visibly. Because the heart no longer has to pump blood against gravity to reach the brain, it actually shrinks—by 10 to 15 percent, depending on mission duration. The spine decompresses without gravity compressing it, so astronauts grow taller in space, which in turn causes significant back pain. Shukla needed medication for this during his mission.
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What you'll learn
- 1 (00:28) **Physiological Shock of Launch & Zero-G** - The body's immediate reaction to the forces of launch and the onset of weightlessness.
- 2 (00:41) **The Heart Shrinks & Spine Expands** - A detailed breakdown of the two most dramatic physical changes upon entering orbit.
- 3 (01:08) **Life Support: Water Recycling** - How the ISS sustains its crew through near-total resource recovery.
- 4 (01:29) **The Emotional Overflight of India** - A personal, emotional account of seeing India from space for the first time.
- 5 (03:57) **Rocket Science for a Kid** - A simple, intuitive explanation of orbits using Newton's cannonball thought experiment.
- 6 (07:19) **Orbital Mechanics & Docking** - How spacecraft maneuver and dock with the ISS at 7.6 km per second.
- 7 (11:05) **Automated Systems & Pilot Override** - The balance between automation and human control during a space mission.
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Guests on this episode
Show Notes
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(00:00) - Intro
(03:35) - What Is Rocket Science?
(12:21) - How Does the Human Body Feel in Zero Gravity?
(21:20) - Is Urine Really Recycled in Space?
(26:36) - Did He Take Indian Food to Space?
(29:30) - How Do Astronauts Sleep in Space?
(33:47) - Why Do Astronauts Breathe Pure Oxygen Before a Spacewalk?
(44:16) - Which Country Has the Most Advanced Space Program?
(46:58) - How Can a Small-Town Kid Become an Astronaut?
(57:45) - The Letter He Wrote to Himself at 14
(1:01:53) - His Journey From NDA to Fighter Pilot
(1:06:43) - Sitting in a Fighter Jet for the First Time
(1:09:43) - The Craziest Thing He's Done in a Fighter Jet
(1:13:16) - The World's Best Fighter Jets
(1:19:12) - How Did He Become a Test Pilot?
(1:24:01) - Why He Decided to Become an Astro
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