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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Why Some Supernovae Look Bluer Than Others?

When very massive stars reach the end of their life, they don’t just disappear—they explode in a powerful event called a supernova. These explosions are so bright that, for a short time, they can outshine an entire galaxy. But even after decades of study, scientists are still trying to understand what exactly happens inside these stars before they explode.

A recent study by Jin and their team has found a surprisingly simple clue to this mystery: the color of the explosion.

What Are Type Ib and Type Ic Supernovae?

Not all supernovae are the same. Some come from stars like our Sun, while others come from very massive stars. Among these, Type Ib and Type Ic supernovae are special because they come from stars that have already lost their outer layers before exploding.

Here’s the difference:

  • Type Ib supernovae still have helium in their outer layers

  • Type Ic supernovae have lost both hydrogen and helium

This may sound like a small detail, but it actually tells scientists a lot about how stars live and die.

Why Do Stars Lose Their Outer Layers?

Massive stars are very active and unstable. Over time, they can lose their outer layers in different ways:

  • Strong winds blowing material into space

  • Sudden eruptions

  • Pull from a nearby companion star (in a binary system)

But here’s the problem:
👉 Scientists don’t fully understand how much mass stars lose before they explode, especially in the final stages.

And since it’s very hard to observe stars just before they explode, researchers study the supernova itself to get clues.

A New Idea: Look at the Color

Traditionally, scientists study supernovae using something called spectroscopy, which breaks light into detailed patterns. This helps identify elements like helium.

But spectroscopy is not always easy, especially when thousands of supernovae are discovered every year.

So, researchers tried something simpler:
👉 They looked at the color of the explosion

Using data from the Zwicky Transient Facility, which scans the sky for cosmic events, the team studied many supernovae and compared their colors at peak brightness.

The Big Discovery

They found a clear pattern:

  • Type Ib supernovae are more blue

  • Type Ic supernovae are more red

This difference was not random—it was strong and consistent across many observations.

What Does “Bluer” or “Redder” Mean?

In space, color is very important. It tells scientists about temperature and physical conditions.

  • Blue light usually means hotter or more energetic conditions

  • Red light means cooler or less energetic conditions

So, if Type Ib supernovae are bluer, it means something about them is different from Type Ic supernovae.

The Simple Explanation

The most likely reason is helium.

  • Type Ib stars still have helium → this affects how light comes out → they look bluer

  • Type Ic stars have lost helium → different light behavior → they look redder

This means the color difference is not just due to dust or distance. It is coming from inside the star itself.

In simple terms:

👉 More helium = bluer explosion
👉 Less helium = redder explosion

Why This Discovery Is Important

This finding gives scientists a new and easier way to study stars.

Instead of using complex methods, they can now:

  • Look at the color

  • Quickly guess the type of supernova

  • Estimate how much material the star lost

This is especially useful because modern surveys are discovering huge numbers of supernovae.

The Future of Supernova Studies

Right now, astronomers are preparing for even bigger surveys like the Legacy Survey of Space and Time.

This project will discover tens of thousands of supernovae every year.

With so much data, scientists need fast and simple tools—and color is one of the best options.

By using color, researchers can:

  • Study large groups of supernovae

  • Find patterns in how stars evolve

  • Improve computer models of stellar life cycles

An Extra Clue: Even Bluer Explosions

The study also found something interesting.

Some rare supernovae, called narrow-line supernovae, are even bluer than normal ones.

Why?

Because they may be interacting with material around the star, called circumstellar matter. This material was thrown out by the star before it exploded.

When the explosion hits this material, it creates extra energy and makes the light appear brighter and bluer.

This could also be connected to mysterious events called fast blue optical transients, which are short but very bright flashes in space.

A Bigger Puzzle About Stars

There is still an unsolved mystery.

According to current theories, many stars should still have some helium before exploding. But in reality, scientists observe many Type Ic supernovae, which have no helium.

So the question is:

👉 How do stars lose so much helium before they explode?

This new research suggests that:

  • Helium loss is more common than expected

  • Stars may go through extra mass loss just before exploding

  • Binary star systems may play a bigger role

What We Still Don’t Know

Even with this discovery, some questions remain:

  • What exact process removes helium so efficiently?

  • Does every massive star go through this stage?

  • Can helium sometimes be hidden instead of lost?

Scientists will need more data and better models to answer these questions.

Conclusion: A Simple Clue with Big Impact

Sometimes, the biggest discoveries come from simple observations.

By just studying the color of exploding stars, scientists have found a new way to understand how massive stars lose their outer layers and prepare for their final explosion.

The discovery that Type Ib supernovae are bluer than Type Ic gives us a powerful new tool to explore the life and death of stars.

As new telescopes and surveys collect more data, this simple idea could help unlock some of the biggest mysteries in space.

In the end, every supernova is like a message from a dying star—and now, we are learning how to read that message more clearly, just by looking at its color.

Reference: Harim Jin, Selma E. de Mink, Sebastian Holzner, Jakub Klencki, Géza Csörnyei, Sung-Chul Yoon, Iair Arcavi, Wolfgang E. Kerzendorf, "Type Ib Supernovae are bluer than Type Ic Supernovae", A&A, 2026. https://arxiv.org/abs/2605.01200


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