10 Fascinating Explanations for Cosmic Mysteries

Space is full of mysteries. This sense of wonder inspires awe, imagination, and the countless space operas that have become pop culture cornerstones.

Some mysteries may never be solved, but attempting to understand them expands our knowledge and often produces striking new images of the universe. Much of the appeal lies in the process itself. The following entries show that few things capture human curiosity quite like a cosmic whodunit.

Related: 10 Groundbreaking Space Missions That Flew under the Radar

10 Why Is There “Coral” on Mars?

Astronomers frequently uncover evidence that Mars was once far more hospitable than it is today, including rock formations that resemble familiar shapes. One recently observed feature has been described as “coral-like.” While it is not biological coral, the rock’s branching structure bears a striking resemblance to it.

These formations are likely the result of mineral deposition combined with erosion. Billions of years ago, liquid water flowed across the Martian surface, carrying dissolved minerals into cracks and pores within rocks. Over time, those minerals hardened. Later, persistent wind erosion stripped away softer material, leaving behind more resistant mineral structures in unusual shapes.

Similar formations have been observed elsewhere on Mars by NASA’s Curiosity rover, suggesting that these processes may have been widespread when the planet had a wetter climate.^[1]

9 Black Holes May Have Helped Shape Early Galaxies

Black holes are often associated with destruction, but research suggests they may also have played a constructive role in the early universe. Some of the earliest supermassive black holes may have influenced the formation of stars and galaxies shortly after the Big Bang.

When matter falls into a black hole, it can produce powerful outflows of energy and gas. These outflows, sometimes called “winds,” may compress surrounding gas clouds, encouraging the formation of new stars under certain conditions.

Although this process is still being studied, observations indicate that black holes and galaxy formation are closely linked. Rather than simply consuming matter, these objects may have helped shape the structure of the early universe in complex and sometimes counterintuitive ways.^[2]

8 Could the Universe’s Expansion Change Over Time?

Current models suggest that dark energy is driving the universe’s expansion at an accelerating rate. If that acceleration continues indefinitely, distant galaxies will eventually move beyond our observable horizon, leaving a colder and more isolated cosmos.

However, recent observations—including data from the Dark Energy Spectroscopic Instrument (DESI)—have raised the possibility that dark energy may not be constant. Instead, it may evolve over time, potentially altering the long-term fate of the universe.

If future data confirm these findings, it could mean that the universe’s expansion behaves differently than currently expected. Some theoretical outcomes include a slowing expansion or even a reversal, though such scenarios remain speculative and require further evidence.^[3]

7 An Extremely Small Galaxy Around Andromeda

Astronomers have identified an unusually small and faint satellite galaxy orbiting Andromeda, our nearest large galactic neighbor. Known as Andromeda XXXV, it is far smaller and dimmer than typical galaxies, making it difficult to detect.

Researchers have described it as surprisingly compact, with a stellar mass of only about 20,000 Suns—tiny compared to the Milky Way’s hundreds of billions of stars. Its size and faintness challenge existing models of galaxy formation, which do not fully explain how such small systems can persist.

The discovery also highlights differences between the Milky Way and Andromeda. The latter appears to host a larger number of satellite galaxies, suggesting variations in how galaxies grow and evolve over time.^[4]

6 Enceladus’s “Tiger Stripes”

Saturn’s moon Enceladus is one of the most intriguing objects in the solar system. Despite being only about 300 miles (483 km) in diameter, it is believed to contain a global ocean beneath its icy surface, possibly around 20 miles (32 km) deep.

One of its most distinctive features is a series of fissures near its south pole known as “tiger stripes.” These cracks release plumes of water vapor and ice particles into space, linking the moon’s subsurface ocean to its exterior environment.

Scientists believe these fissures are driven primarily by tidal forces from Saturn, which flex the moon’s interior and generate heat. This process helps maintain liquid water beneath the surface and drives the ongoing activity observed today. The extreme cold of the surface—around -328°F (-200°C)—contrasts sharply with the dynamic processes occurring below.^[5]

5 Webb Reveals Extreme Galactic Temperatures

The James Webb Space Telescope has provided new insight into star formation within the Phoenix galaxy cluster, a system anchored by a supermassive black hole with a mass of roughly 10 billion Suns. Under normal conditions, such a powerful black hole would heat surrounding gas and suppress star formation. However, the Phoenix cluster appears to defy that expectation.

Earlier observations suggested that large amounts of gas—necessary for star formation—were missing. Webb’s infrared instruments have since detected this material at an intermediate temperature, helping to resolve the discrepancy. In cosmic terms, this “moderate” temperature is about 540,000°F (300,000°C), situated between extremely hot gas at roughly 18 million°F (10 million°C) and much cooler gas at around 18,000°F (10,000°C).

This finding helps explain how star formation can continue in environments previously thought to be too hostile. It also highlights the enormous range of temperatures that exist in galaxy clusters and the complex processes that govern how stars are born.^[6]

4 Betelgeuse May Have a Hidden Companion

Betelgeuse, one of the most recognizable stars in the night sky, may have a long-suspected companion. This red supergiant, located roughly 700 times the radius of the Sun, has been studied for centuries due to its brightness and its relatively advanced stage of stellar evolution.

Recent observations suggest that a smaller, hotter companion star could be orbiting Betelgeuse at a distance of about four times the Earth-Sun distance. This companion is estimated to be about 1.5 times the mass of the Sun and significantly dimmer in visible light.

If confirmed, the presence of this companion could help explain certain irregularities in Betelgeuse’s brightness and behavior. However, its existence and long-term interaction with Betelgeuse remain subjects of ongoing study, and predictions about future interactions between the two stars are still uncertain.^[7]

3 Mimas May Harbor a Hidden Ocean

Saturn’s moon Mimas, often compared to the fictional Death Star due to its large impact crater, may contain a subsurface ocean beneath its icy crust. For years, it was considered a relatively inactive world, but recent research suggests that its internal structure may be more dynamic than previously thought.

Scientists propose that changes in Mimas’s orbit could have increased internal heating through tidal interactions with Saturn. This process may have melted portions of the moon’s interior, creating a liquid ocean beneath the surface. Evidence also suggests that the thickness of the ice shell may have evolved over time as these internal processes continued.

If confirmed, this would expand the list of ocean-bearing worlds in the solar system and strengthen the idea that potentially habitable environments may be more common than once believed.^[8]

2 A “Fiery Hourglass” Around a Young Star

Observations from NASA’s James Webb Space Telescope have revealed a striking hourglass-shaped structure surrounding a young protostar known as L1527. At approximately 100,000 years old, the object is still in the early stages of stellar formation and has not yet begun sustained hydrogen fusion.

At the center of the structure is a dense disk of gas and dust that is gradually feeding the growing star. Over time, this material may form a planetary system. The hourglass shape is created by powerful jets of material ejected from the protostar, which carve out cavities in the surrounding gas.

These jets generate shock waves and turbulence that can disrupt nearby material, limiting the formation of additional stars in the immediate vicinity. This process illustrates how star formation can both create and inhibit new stellar systems within the same region.^[9]

1 Salty Asteroids and the Ingredients for Life

Samples collected from the asteroids Ryugu and Bennu have revealed unexpectedly high concentrations of salts and water-related minerals. These findings suggest that such bodies once contained significant amounts of liquid water, likely in the form of briny pockets that later evaporated.

These environments may have allowed complex chemical reactions to occur, producing organic compounds that are considered building blocks of life. Rather than being limited to planets with stable oceans, some of these processes may have taken place on much smaller bodies early in the solar system’s history, more than 4.5 billion years ago.

While this does not indicate that life itself formed on asteroids, it does support the idea that key prebiotic ingredients could have developed in a wide range of environments and may have been delivered to planets like Earth through impacts. This broadens our understanding of where and how life’s chemistry might begin.^[10]