From Rotten Eggs to Sweet Almonds: Scientists Explore the Smell of Space to Understand the Universe

In their quest to better understand the universe, scientists are analyzing the **smells of space** — from nearby planets to exoplanets hundreds of light-years away. According to a report by the **BBC**, astronomers and scent experts believe the cosmos is filled with a surprising variety of aromas, some pleasant, others repulsive.

**Marina Barcenilla**, a perfumer, fragrance educator, and astronomy researcher, describes **Jupiter** as a “**stinking chemical bomb**.” She explains that the largest planet in our solar system has multiple layers of clouds, each with a unique chemical composition. “The gas might lure you in with the sweet scent of toxic marzipan clouds,” she says, “but the deeper you go, the worse it gets.”

The top layer of Jupiter’s clouds is made of **ammonia ice**, which smells like **cat urine**, according to Barcenilla. Descending deeper, you encounter **ammonium sulfide**, a compound that combines the smells of **ammonia and sulfur** — “a mix brewed in hell,” she says. The sulfur compounds release an odor similar to **rotting eggs**.

Marina’s fascination with the **smell of space** began during her early academic years studying the cosmos. She realized she had access to many of the molecules in her lab that exist in space — and could recreate their smells.

While continuing her research into signs of life on Mars, she also started experimenting with **simulating extraterrestrial scents**, from **decaying organic matter** to **nutty, sweet aromas**. She believes space is a surprisingly fragrant place — if we had the ability to smell it.

Barcenilla points out that every planet, moon, and gas cloud has a **distinct scent profile**, though we can’t smell them directly. Our **sense of smell** works by detecting chemical molecules in the environment. The human nose contains dense networks of neurons with **chemoreceptors** that send signals to the brain when they encounter specific molecules, allowing us to recognize different scents.

The ability to smell plays a crucial role in human survival and emotional well-being. Beyond identifying food or sensing danger, smell helps us **trigger memories and form social bonds**. After millions of years of evolution, our sense of smell is deeply intertwined with our emotional health.

Even the **odor inside a space station**, scientists note, can feel alien — adding to the sensory strangeness of being far from Earth.