Deep Space Exploration Breakthroughs: Vera Rubin's 3.2 Billion Pixel Camera, Asteroid Close Calls & AXE4 Mission Updates

Anna: Welcome to Astronomy Daily. Your exciting

look at the very latest in space news. I'm

Anna and today we're diving into a cosmic

journey that spans from groundbreaking new

telescopes revealing deep space mysteries to

critical Earth observations and the latest in

human spaceflight. We've got an incredible

lineup for you. We'll explore the first

breathtaking images released by the new Vera

Rubin Observatory, discuss a potentially

dramatic close call with an asteroid that

could impact the moon, and and update you on

a private astronaut mission heading to the

International Space Station. Plus, we'll

delve into the decoding of an ancient radio

signal that the universe tried to keep secret

for billions of years. And marvel at

spectacular new views of Earth from orbit,

thanks to ESA's biomass satellite. Get ready

for an action packed episode.

The astronomical community is buzzing with

excitement as the Vera C Rubin Observatory

has officially released its very first images

of space. This momentous occasion

heralds a new era of discoveries about our

universe. Perched atop the Kerro Pachon

peak in the Chilean Andes, this giant

telescope is designed for an ambitious 10

year to create an unprecedented time

lapse video of deep space, providing a

comprehensive view of the entire southern

hemisphere's sky every three days.

Rubin's true claim to fame lies in its

imaging powerhouse, the world's most powerful

digital camera. It's a 3.2 billion

pixel behemoth known as the Legacy Survey of

Space and time, or LSST.

For perspective, the latest iPhone has a 48

million pixel camera. The LSST alone

weighs 3 tonnes and features an 8 metre wide

mirror. This incredible instrument will allow

astronomers to capture details far beyond

what was previously possible. Named in

honour of pioneering American astronomer Vera

Florence Cooper Rubin, whose groundbreaking

work provided the first direct evidence for

dark matter. The observatory is poised to

help answer some of the cosmos's deepest

questions. These include the nature of dark

matter and dark energy, and how galaxies have

evolved. Thousands of astronomers

globally will rely on the vast amounts of

data Rubin will generate. It's expected to

deliver an astounding 10 million alerts every

single day, flagging objects that have either

changed position or brightness. Some alerts

could reveal entirely new cosmic phenomena.

As Professor Rachel Webster from the

University of Melbourne, who leads

Australia's collaboration, puts it in

reality, there is so much we still don't know

about the universe, so the scope of what may

be discovered is what's really exciting.

Professor Webster explains. Rubin will survey

the entire southern sky with an agnostic

approach, expecting unexpected new things.

This includes very faint diffuse objects and

sudden transient events. Things that go bang

in the night or Explode and change brightness

rapidly. The success of Rubin

also relies on advanced technology and

international collaboration, leveraging

cutting edge tools like artificial

intelligence. Its data will complement the

Square Kilometre Array telescope currently

under construction, promising to

significantly advance our understanding of

dark matter, dark energy, and even how

supermassive black holes interact with their

environments. And a sample of what can be

achieved. In just 10 hours of observing the

night sky, the powerful new telescope

detected more than 2,000 new asteroids,

including a few that will pass near Earth.

Incredible. This truly represents a thrilling

leap forward in astrophysics

from the awe inspiring depths of the

universe.

We now turn our attention a little closer to

home. To a celestial body that might just

have a very eventful year in 2032.

Our moon. While initial worries about a

direct impact on Earth have thankfully been

ruled out, a new study suggests that a city

killer asteroid named 2024

yr4 might still be headed for a dramatic

encounter not with us, but with our lunar

companion. This asteroid, approximately 60

metres wide, was briefly the subject of

concern earlier this year, with a 3.1%

chance of hitting Earth in December 2032,

a significant probability for a space rock of

this size. Subsequent observations from

telescopes put those fears to rest for our

planet. However, new data from

the James Webb Space Telescope in May has

nudged the odds of it crashing into the moon

up to 4.3%. If this

happens, it would be quite an event.

Lead study author Paul Wiegert from Canada's

University of Western Ontario estimates it

would be the largest asteroid to strike the

moon in around 5,000 years, releasing

energy comparable to a large nuclear

explosion. Simulations indicate that up to

100 million kilogrammes of material could be

shot out from the moon's surface. Now here's

where it gets interesting for us down on

Earth. If the asteroid were to hit the side

of the moon facing our planet, which is

roughly a 50% chance, up to

10% of that ejected debris could be pulled

into Earth's gravity over the following days.

While our atmosphere would protect the

surface from these millimetre to centimetre

sized lunar rocks, these fast moving

particles, described as being a lot like a

bullet, could pose a serious threat to our

orbiting satellites. By 2032,

we expect a much larger number of satellites

orbiting Earth. And an impact could lead to

more than a thousand times the normal number

of meteors threatening them. For those of

us on the ground, however, this cosmic bullet

train could mean a truly spectacular

meteor shower lighting up the night sky.

It's important to remember that the current

odds of a direct hit on the near side of the

moon remain at just 2%.

We won't get another clear look at asteroid

2024 yr 4 until

2028, so for now it's a

waiting game. But if a direct lunar hit does

become likely, scientists believe humanity

would have enough time to plan a mission to

potentially deflect it. Much like NASA's DART

mission successfully altered the trajectory

of dimorphos in 2022. Though

Weigert cautions that deflecting something

zooming so close to Earth could be a little

dangerous, this fascinating research is

currently a preprint study awaiting peer

review and submission to the Astrophysical

Journal Letters.

Shifting our focus from potential lunar

impacts, let's turn to the exciting world of

private spaceflight, where humanity continues

its push into low Earth orbit.

SpaceX and Axiom Space have just announced a

new launch date for the AXE4 mission to the

International Space Station, bringing us

another step closer to a more accessible

space for astronauts from around the globe.

The four person crew is now slated to lift

off aboard a SpaceX Crew Dragon spacecraft

atop a Falcon 9 rocket no earlier than

June 25 at 2:31am

um EDT from Launch

Complex 39A at NASA's Kennedy Space

Centre in Florida. You might recall this

launch was previously delayed last week due

to a leak detected aboard the ISS's Zvezda

module. While the leak itself isn't new,

a change in its pressure data prompted NASA

and Axiom to postpone the mission to ensure

safety. No update on the leak's current

status was provided with the new launch

announcement, but the green light suggests

confidence in the station's integrity. This

mission is set to be a landmark one for

several reasons. The Axe 4 crew will be led

by former NASA astronaut and Axiom's director

of human Space Flight Peggy Whitson, who will

serve as mission Commander. Joining her are

Shubanshu Shukla from India, Slavas

Usnanski Wisniewski from Poland, and and

Tibor Kapu from Hungary. What's particularly

exciting about this crew is that for

Shubanshu, Slawos and Tibor, this will mark

their nation's first ever astronauts to

launch on a mission to the iss. It's a

fantastic testament to the expanding

international participation in space

exploration. The mission is expected to last

two weeks, and during their time aboard the

orbiting lab, the Axe 4 crew plans to

conduct an impressive number of activities.

They're scheduled to undertake more than 60

science experiments and STEM. That's science,

technology, engineering and math outreach

events surpassing any previous Axiom mission.

If all goes according to this New schedule

the Cruise Dragon spacecraft is slated to

dock with the ISS at approximately

7am M. EDT on Thursday,

June 26. It's an exciting time for private

spaceflight, showcasing the growing

capabilities and collaborations that are

shaping the future of human presence in

space.

From the immediate future of human

spaceflight, let's now journey back in time

billions of years to unravel one of the

universe's most ancient and secretive

messages. Scientists are beginning to decode

a mysterious radio signal from deep space

that has been hiding secrets about the

universe's earliest stars, offering

a rare glimpse into moments the cosmos tried

to keep from us for aeons. In the

vast, dark expanse of the universe, there's a

profound mystery surrounding the first stars,

those massive, luminous celestial bodies

known as Population 3, stars that

illuminated the cosmos in its earliest

stages. These stars are so incredibly

distant in time that their properties have

remained largely unknown despite decades of

scientific inquiry. But now a new method is

bringing them into focus, using faint signals

emitted billions of years ago. The

breakthrough lies in a subtle, almost

undetectable radio signal that has persisted

through time. The 21 centimetre signal.

This cosmic whisper, emitted by hydrogen

atoms shortly after the Big Bang, serves as a

crucial marker from a period known as the

cosmic dawn. This was the pivotal moment when

the very first stars began to form and light

up the universe. What makes the 21

centimetre signal so incredibly valuable is

that, unlike visible light or X rays,

it can offer direct insights into the masses,

behaviours and distribution of these

elusive first stars. Until recently,

however, astronomers hadn't fully grasped how

this delicate signal could truly unlock the

secrets of the early cosmos. An

international team of astronomers, led by

Professor Anastasia Fialkoff and at the

University of Cambridge's Institute of

Astronomy, has cracked a crucial aspect

of this signal. Their groundbreaking work,

published in Nature Astronomy, reveals that

this ancient radio signal is remarkably

sensitive to the properties of these initial

stars. Specifically, their research

suggests that the signal could be used to

estimate the masses of Population 3 stars

whose light we can never directly observe.

This insight is truly significant, opening a

new door to understanding the early universe,

which was primarily composed of hydrogen and

helium. By studying how the 21

centimetre signal has been altered by these

stars, astronomers can begin to map the

transformation from a dark, uniform mass to

the complex and diverse cosmos we see today.

This monumental effort is being supported by

two ambitious projects, reach, or the

Radio Experiment for the Analysis of cosmic

hydrogen, and the Square Kilometre Array,

known as ska. REACH is currently in

its early calibration phase. Using radio

antennas to capture the faint 21 centimetre

signal. The SKA, on the other hand,

is an even larger array of antennas under

construction, poised to map vast regions of

space and study fluctuations in cosmic

radiation, providing an invaluable resource

for understanding the earliest epochs of the

universe. These projects are absolutely

essential to the future of radio astronomy,

focusing on statistical patterns of faint

signals to study the early universe in

unprecedented detail. Professor

Fielkov's team predicts that both REACH and

SKA will allow astronomers to study the

distribution, luminosity and masses of

population three stars, deepening our

understanding of the forces that shaped the

cosmos in its infancy. One of

the most fascinating aspects of this research

is its exploration of how X ray binaries,

pairs of stars where one is a collapsed

object like a black hole, impact the 21

centimetre signal. These binaries are thought

to have played a significant role in the

early universe by emitting high energy

radiation that affected the surrounding gas

and consequently altered the 21 centimetre

signal. Professor Fielkov's team

developed a model incorporating the effects

of X ray binaries, suggesting that

previous studies might have underestimated

their influence. This discovery adds another

layer of complexity to our understanding of

how the first stars shaped the universe,

making the 21 centimetre signal an even more

powerful tool for mapping the earliest

moments in cosmic history. The potential

of the 21 centimetre signal is further

amplified by the increasing power of radio

telescopes. Unlike optical telescopes that

capture detailed images of distant stars and

galaxies, radio telescopes like REACH and

SKA rely on detecting these faint signals to

infer the properties of cosmic phenomena.

While they won't provide direct images of

individual stars, they offer an extraordinary

opportunity to study large scale patterns in

the universe's earliest phases. As Dr.

Eloy Dilara Acedo, principal

investigator of the REACH project, notes,

these radio observations are essential for

understanding the mass and properties of the

first stars, laying crucial groundwork for

future discoveries. Now let's

shift our gaze from the incredibly distant

past to the immediate present. And a new eye

watching our own planet.

Cheers and excitement erupted at ESA's Living

Planet Symposium in Vienna with the release

of the first images from ESA's biomass

satellite. These striking views offer a

spectacular new window into Earth's forests,

deserts and glaciers, marking a, uh, major

milestone in our understanding of how our

planet stores carbon and how vital ecosystems

are being transformed. Just two months after

its launch, the biomass mission is already

delivering on its promise, providing a

glimpse into the incredible potential of its

novel radar system while still in its

commissioning phase. Fine tuning to ensure

the highest quality data, the early Images

are clearly showcasing the satellite's

capabilities. Michael Fehringer,

ESA's biomass project manager,

described these first images as nothing

short of spectacular, emphasising that they

are only a mere glimpse of what's still to

come. Simonetta Celli, ESA's director

of earth Observation Programmes, shared the

emotional impact of seeing the results,

calling it very symbolic of the effort behind

the scenes and the potential that this

mission has. What makes

biomass so revolutionary is its unique P

band radar. Unlike other satellites,

this penetrating radar system captures the

full vertical structure of forests beneath

the canopy. For instance, in images from

Bolivia, where rainforest meets riverine

floodplains, biomass highlights distinct

ecosystems like green rainforests, red

forested wetlands and blue purple grasslands,

all while the dark, snaking Beni river cuts

through the landscape. When compared side by

side with images From Copernicus Sentinel 2,

it's clear that while Sentinel 2 is limited

to surface features, biomass unlocks a, uh,

crucial 3D view of forests, vital for

accurate carbon accounting. The satellite has

also provided striking views over the

northern Amazon rainforest in Brazil and and

the mountainous Halmahera rainforest in

Indonesia, revealing subtle terrain and

vegetation differences even in dense,

ecologically critical areas. But

its capabilities extend far beyond forests.

Biomass has shown its incredible power in

other extreme environments, like the Sahara

Desert in northern Chad. Its P band radar can

penetrate up to 5 metres below the desert

surface, exposing hidden structures like

ancient riverbeds and geological formations

long buried beneath the arid terrain.

This capability opens new frontiers in

paleoclimate research and groundwater

mapping, offering insights into Earth's past.

Furthermore, in the frozen expanse of

Antarctica, biomass has peered into the

Nimrod Glacier and the Trans Antarctic

Mountains, demonstrating its ability to track

internal ice structures and flow velocities.

This is crucial for understanding ice sheet

dynamics and stability, which are critical

factors in predicting future sea level

changes. While these initial results are

still raw and not yet fully calibrated for

scientific analysis, they unequivocally

confirm that biomass is well on track to meet

and potentially exceed its ambitious goals.

Designed to span five years, this mission

will provide consistent global coverage of

Earth's forested regions. The data it

collects will be vital for improving climate

models, supporting global conservation

efforts and refining carbon accounting.

As the biomass satellite transitions into

full operational mode, scientists around the

world are eagerly anticipating the

comprehensive data sets that could truly

transform how we monitor and protect the

living lungs of our planet.

We've journeyed through a wide range of

cosmic updates today, exploring everything

from the profound mysteries of the universe's

distant past, thanks to signals hidden for

billions of years, to the immediate future.

Of human spaceflight as private astronauts

prepare for the iss. We also looked at

potential close calls with asteroids and how

new satellite technology is revolutionising

our view of Earth's precious ecosystems.

Thank you for joining us on this episode of

Astronomy Daily. I'm your host, Anna.

Before we sign off, remember, you can always

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