What is a ‘Space Jellyfish’? Explaining the Mysterious Glow Seen Over the Philippines

Residents across various parts of the Philippines were treated to a rare celestial sight on the evening of Saturday, April 11, 2026. Luminous, jellyfish-shaped clouds appeared in the night sky, sparking curiosity and reports of unusual lights. The Philippine Space Agency (PhilSA) has since confirmed that this phenomenon was caused by the passage of a Chinese rocket.

The Cause: The Jielong-3 Rocket Launch

The stunning visual display was the result of the Jielong-3 (also referred to as the Smart Dragon-3) rocket launch. The rocket was launched from the South China Sea at approximately 7:32 p.m. PhST. According to reports, the rocket was carrying CentiSpace-1 satellites into low Earth orbit.

Observers in the Philippines, including those in Tarlac, reported seeing the “fireball” and glowing lights around 7:40 p.m. PST, shortly after the launch took place.

The Science Behind the ‘Space Jellyfish’

Even as it may look like an alien visitation or a strange weather event, the “space jellyfish” is a well-documented scientific occurrence. It happens when a rocket’s exhaust plume is released at high altitudes during dawn or dusk.

How it Works:

• Sunlight Interaction: The phenomenon occurs when the exhaust plume is directly illuminated by sunlight, even though observers on the ground are already in darkness.
• Atmospheric Scattering: Because the plume expands in the thin upper atmosphere, it scatters the sunlight.
• Visual Result: This creates a luminous, expanding glow that resembles a jellyfish, visible over wide areas during twilight conditions.

Frequently Asked Questions

Is a “space jellyfish” dangerous?

No. It is a harmless optical phenomenon caused by the interaction of light and rocket exhaust in the upper atmosphere.

Why can we see it if it’s nighttime on the ground?

The rocket reaches altitudes where the sun is still visible above the horizon, even after the sun has set for people on the Earth’s surface.

Looking Ahead

As space exploration and satellite deployments increase, sightings of these “space jellyfish” are likely to become more common. These events serve as a stunning reminder of the intersection between human engineering and natural atmospheric physics.