Dark Sky Victory, Jupiter Redefined, and Monster Sunspot Faces Earth

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Welcome to Astronomy Daily, your source

for the latest space and astronomy news.

I'm Anna.

And I'm Avery.

Today's Thursday, February 5th, 2026.

And we've got a great lineup of stories for you today.

We certainly do.

We'll be covering a major victory

for Dark Sky Preservation, groundbreaking measurements

of Jupiter's true size, a monster

sunspot currently facing Earth, mysterious Martian weather,

some frank talk from NASA about the SLS rocket,

and how red giant stars destroy their own planetary systems.

White the cosmic menu, but before we dive in,

a quick reminder that you can get more space news

and community discussion at astronomydaily.io

and you can find us on social media at AstroDailyPod

across all platforms.

All right, let's start with some good news for astronomy.

Avery, what's happening with Earth's darkest skies?

This is a story that really highlights

how fragile our connection to the night sky has become, Anna.

Astronomers around the world are breathing

a collective sigh of relief after plans

for a major industrial plant

near one of Earth's darkest sky locations have been canceled.

Oh, that's wonderful news.

Where was this proposed plant going to be built?

The development was planned near the Roque de los Moschachos

Observatory in the Canary Islands,

which hosts some of the most important telescopes

in the Northern Hemisphere.

This site is renowned for having some

of the darkest, clearest skies accessible to modern astronomy

and the proposed industrial facility

would have introduced significant light pollution to the area.

I can imagine the astronomical community was pretty concerned.

These pristine observation sites are becoming increasingly rare.

Absolutely.

What makes this particularly significant

is that it represents a growing recognition

of the scientific value of dark skies.

The cancellation came after sustained advocacy

from the astronomy community

who emphasized not just the local impact,

but the global scientific importance

of preserving these observation sites.

With light pollution spreading worldwide,

losing access to naturally dark skies

would be devastating for ground-based astronomy.

It's encouraging to see that science preservation

can still win out over industrial development.

These observatories represent decades of investment

and irreplaceable viewing conditions.

Exactly.

And it sits an important president

for protecting other astronomical sites around the world.

The International Dark Sky Association

has noted that this decision could strengthen

arguments for dark sky preservation elsewhere.

Great to hear some positive environmental news for a change.

Now, speaking of observations from those pristine sites,

let's talk about what we've learned about Jupiter.

NASA's Juno mission has completely redefined

our understanding of the gas giant size and shape, hasn't it?

It really has, Anna.

This is one of those discoveries

that makes you realize how much we still don't know

about even our most familiar planetary neighbors.

Juno's precise measurements have revealed

that Jupiter is both larger and more oblate

than we previously thought.

When you say oblate, you mean it's flattened

at the poles, right?

Exactly.

All rotating bodies experienced this to some degree,

even Earth bulges slightly at the equator.

But Jupiter's rapid rotation makes us

affect much more pronounced.

What's new is just how pronounced it actually is.

Juno's gravity measurements have shown

that Jupiter's equatorial diameter is slightly larger

than our previous estimates, while the distance

between the poles is actually smaller.

The planet is basically wider and flatter than we realized.

So what caused this miscalculation?

I mean, we've been observing Jupiter for centuries.

Well, measuring the size of a gas giant

with no solid surface is trickier than it sounds.

Earlier measurements relied primarily

on optical observations, essentially looking

at where Jupiter's atmosphere becomes opaque.

But Juno uses extremely precise gravity measurements

as it orbits the planet.

By measuring tiny variations in how

Jupiter's gravity affects the spacecraft's trajectory,

scientists can determine the planet's mass distribution

with unprecedented accuracy.

And I assume Jupiter's rotation plays a big role

in this shape.

Absolutely.

Jupiter rotates once every 10 hours.

That's incredibly fast for something so massive.

This rapid spin creates enormous centrifugal forces

that push material outward at the equator.

What Juno has revealed is that this effect penetrates

much deeper into the planet than we thought.

The measurement suggests that Jupiter's interior structure,

including how its metallic hydrogen layer behaves,

is more complex than our models predicted.

This probably has implications for understanding

other gas giants, too.

Both in our solar system and around other stars.

Definitely.

Understanding Jupiter's interior helps us

refine our models of how gas giants form and evolve.

And since we can't exactly drill into Jupiter

to see what's inside, these gravity measurements

are the next best thing.

Every new piece of data from Juno

helps us understand not just Jupiter,

but the entire class of giant planets.

Fascinating stuff.

It's amazing that after all this time studying Jupiter,

we're still discovering fundamental things

about its basic structure.

Now, let's shift from distant Jupiter to our very own sun,

which is putting on quite a show right now.

Avery, there's a massive sunspot facing Earth at the moment.

There certainly is Anna, and it's a monster.

The sunspot currently facing Earth

spans about 15 Earth diameters across.

That's roughly 120,000 miles.

To put that in perspective, you could fit 15 Earth side-by-side

across a single sunspot.

That's genuinely hard to wrap your head around.

And I understand people can actually

see this with the right equipment.

Yes, but this comes with a crucial safety warning.

Never looked directly at the sun without proper solar filters.

This can cause permanent eye damage or blindness.

However, with proper eclipse glasses

or solar filters designed specifically

for solar observation, amateur astronomers

can spot this sunspot fairly easily.

It's large enough to be visible even

with modest magnification.

What exactly is a sunspot for our listeners who might not know?

Sunspots or regions on the sun's surface

were powerful magnetic fields breakthrough,

temporarily suppressing the hot convective currents

that normally transport heat from the sun's interior.

This makes these regions cooler than their surroundings.

Around 6,500 degrees Fahrenheit,

compared to the normal surface temperature

of about 10,000 degrees.

That temperature difference is why

they appear dark against the brighter background.

And these magnetic fields,

there would cause solar flares and coronal mass ejections, right?

Exactly.

Large complex sunspot groups like this one

have tangled magnetic field lines

that can suddenly reconnect and release

enormous amounts of energy.

This particular sunspot is being closely monitored

because of its size and complexity.

When these magnetic structures become unstable,

they can unleash powerful solar flares

and potentially hurl billions of tons of charged particles

toward earth in what's called a coronal mass ejection

or CME.

Should we be concerned about potential impacts on earth?

Base weather forecasters are definitely keeping a close eye on it.

A large CME directed at earth could affect satellites,

power grids and radio communications,

and could produce aurora displays

at lower latitudes and usual.

However, our sun monitoring satellites

like Soho and SDO give us advanced warning,

typically several days before CME arrives.

So while this sunspot certainly has the potential

to be active, we have the monitoring infrastructure

in place to track any eruptions

and issue warnings if necessary.

It's one of those reminders that we live inside

the sun's atmosphere in a sense.

We're constantly bathed in the solar wind.

That's a great way to think about it.

Earth's magnetic field shields us from most of the effects,

but we're definitely connected to our stars activity.

And for amateur astronomers,

it's a rare chance to see solar activity

on this scale with safe, solar viewing equipment.

All right, from solar weather to Martian weather.

Avery, there's been an unusual storm on Mars

that's revealing something new about the red planet.

Yes, and this is a particularly intriguing discovery

because it challenges some of our assumptions

about Martian meteorology.

Researchers have observed an unusual storm system

on Mars that's providing new insights

into the planet's atmospheric dynamics

and what lies beneath its dusty surface.

What made this storm unusual?

I mean, Mars is famous for its dust storms.

True, but this storm exhibited behavior

that didn't fit our standard models of Martian weather patterns.

The storm's movement and structure

suggested it was being influenced by subsurface features.

Essentially, the topology and composition

beneath Mars' surface was affecting

how the storm developed and moved across the planet.

So the ground itself is influencing the weather.

How does that work?

It's similar to how mountains on Earth affect weather patterns,

but Mars has some unique factors.

The thin Martian atmosphere, less than 1%

of Earth's atmospheric pressure,

means that surface features have a proportionately larger

impact on atmospheric circulation.

Additionally, variations in surface temperature

due to different rock and soil composition

can create localized heating patterns

that drive atmospheric motion.

And what did the storm reveal about what's underground?

The storm's behavior suggested there are variations

in subsurface composition that weren't previously mapped.

By tracking how the storm responded to these hidden features,

scientists could essentially use the storm

as a probe to detect what's below the surface.

It's a bit like how doctors use ultrasound.

You're using one thing to indirectly sense another.

That's a clever way to gather geological information.

Are there implications for future Mars missions?

Definitely.

Understanding these subsurface features

is important for several reasons.

First, they could indicate locations

where subsurface water ice might be present.

Second, they help us understand Mars' geological history

and how the planet evolved.

And third, for future crude missions,

knowing what's underground is essential

for landing site selection and resource utilization,

you want to land somewhere with access to useful materials.

It's fascinating how atmospheric science and geology intersect

like this.

One storm can tell you so much about an entire planet.

Exactly.

And it's another example of how every Mars observation

opens new questions.

The more we learn, the more complex and interesting Mars becomes.

Indeed.

Now, speaking of complex and interesting,

let's talk about NASA's space launch system.

There's been some remarkably frank discussion

from NASA about this rocket's future hasn't there.

Yes, and it's notable precisely

because NASA officials are rarely

this candid about program challenges, Anna.

For the first time, NASA is publicly acknowledging

what many industry analysts have been saying for years.

The space launch system has fundamental cost

and sustainability issues that need to be addressed.

This is the rocket that's supposed

to take astronauts back to the moon

part of the Artemis program, right?

That's correct.

The SLS is the most powerful rocket NASA has ever built,

designed specifically for deep space missions.

It successfully launched Artemis I in late 2022,

sending an uncrewed Orion spacecraft around the moon.

And it's scheduled to launch Artemis II,

the first crude lunar mission in over 50 years.

Though that timeline keeps shifting.

Though what's the issue?

The rocket works, doesn't it?

The rocket does work when it flies.

It performs beautifully.

The problem is the economics.

Each SLS launch costs roughly $4 billion

and the system can only fly about once a year

with current infrastructure.

For comparison, SpaceX's Starship,

which is also designed for deep space missions

and has creator payload capacity,

is projected to cost a tiny fraction of that per launch

and could potentially fly dozens of times per year.

Four billion per launch, that's hard to justify,

especially when alternatives exist.

Exactly.

And that's what makes these recent NASA

statements so significant.

Administrators are openly discussing the elephant in the room

that maintaining SLS in its current form

may not be sustainable for a long-term lunar

or Mars exploration program.

They're acknowledging that the program

needs to either dramatically reduce costs

or potentially transition to commercial alternatives.

This must be a difficult position for NASA.

The SLS represents decades of development

and enormous investment.

It absolutely is.

There are also political considerations.

The SLS program supports jobs across multiple states

and has strong congressional backing.

But NASA is facing budgetary pressure

and needs to make realistic plans for sustainable exploration.

The acknowledgement that SLS's costs or problematic

is a significant shift towards having honest conversations

about the future of deep space exploration.

What are the alternatives?

Would NASA switch to something like Starship entirely?

That's one option being discussed, though it's complicated.

NASA has already contracted with SpaceX

to provide a lunar lander version of Starship

for Artemis missions.

So there's already commercial partnership in place.

Some proposals suggest using commercial

heavy lift rockets for cargo and potentially even crew

while others advocate for a hybrid approach.

The challenge is that any major change

would require congressional approval

and significant replanting of Artemis architecture.

It sounds like we're at an inflection point

for NASA's deep space ambitions.

We really are.

This is one of those moments where honesty about challenges

is the first step towards finding solutions.

The fact that NASA is willing

to have this conversation publicly suggests

they're serious about finding a sustainable path forward.

Even if it means difficult decisions

about programs that have tremendous legacy

and political support.

Well, we'll certainly be watching how this develops.

Now, for our final story,

let's venture into the realm of stellar evolution.

Avery, red giant stars are apparently

destroying their own planetary systems.

They are, Anna.

And this research gives us a rather apocalyptic preview

of what will happen to our own solar system

in about five billion years.

Astronomers have observed how red giant stars

stars in their late evolutionary stages

systematically destroy gas giant planets

that orbit too close to them.

This is what our sun will eventually become, right?

A red giant?

Exactly.

When stars like our sun exhaust

a hydrogen fuel in their cores,

they begin fusing helium and expand dramatically.

Our sun will eventually swell

to perhaps a hundred times its current diameter,

likely engulfing Mercury, Venus, and possibly Earth.

But this research focuses on what happens to planets

that survive the initial expansion,

particularly gas giants at distances similar

to Jupiter and Saturn's current orbits.

Though these planets survive the star's expansion,

but not what comes after.

Precisely.

As the star becomes a red giant,

several destructive processes occur.

First, the star becomes much more luminous.

Our sun will eventually be about 2,000 times brighter

than it is now.

This intense radiation heats the atmospheres

of gas giant planets,

causing them to expand and potentially evaporate.

Second, red giant stars have powerful stellar winds

that can strip away planetary atmospheres.

And third, the star's expansion causes tidal forces

that can alter planetary orbits.

That sounds like a recipe for planetary destruction.

What exactly did the researchers observe?

They studied multiple red giant star systems

and found evidence of gas giant planets

in the process of being destroyed.

In some cases, they detected the spectral signatures

of planetary material being stripped away

and falling into their host star.

In others, they found gas giants

with highly eroded atmospheres,

clearly showing the effects of their star's evolution.

It's like watching different stages

of the same destructive process.

This presumably has implications

for our understanding of how planetary systems

evolve over time.

Absolutely.

One of the key findings is that the habitable zone,

the region where liquid water could exist,

moves outward as the star becomes a red giant.

Ones of Jupiter or Saturn currently frozen ice worlds

might temporarily become habitable as our sun swells.

But this research shows that even if these worlds

briefly enter the habitable zone,

the gas giants they orbit are being actively destroyed

by the dying star.

It's a very dynamic and ultimately doomed situation.

It really puts our solar system's long-term future

in perspective.

It does.

Though I should emphasize,

we have about five billion years

before any of this happens.

So there's no immediate cause for concern.

But it does remind us that solar systems

like everything else in the universe have life cycles.

Understanding these cycles helps us interpret

what we see around other stars

and appreciate that the stable, long-lived solar system

we enjoy is a temporary phase in cosmic terms.

A sobering but fascinating look at stellar evolution.

It's one thing to know intellectually

that the sun will eventually die,

but quite another to see the detailed process

of what happens to the planets.

Exactly.

And who knows?

In five billion years,

humanity's descendants, if they exist,

will likely have long since relocated

to other star systems.

Understanding how stars age and die

is actually crucial for picking good long-term neighborhoods

out in the galaxy.

That's a nice, optimistic note to end on.

Well, that's all we have for you today on Astronomy Daily.

And remember to check out our website

at astronomydaily.io for more space news

and to join our community discussions.

You can also find us on social media at AstroDailyPod.

Thanks for listening and keep looking up.

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