Τέσσερις μεγάλοι αστεροειδείς προσέγγισαν την Γη...

 

Hellasjournal.com Read on blog or Reader Προσέγγισαν, χαιρέτισαν τη Γη …και αποχώρησαν: 4 αστεροειδείς σε διάστημα μόλις 12 ωρών -Με διάμετρο μεταξύ 30 και 177 μέτρα, οι δύο ανακαλύφθηκαν πρόσφατα [videos] By ourania on October 25, 2024 Τέσσερις μεγάλοι αστεροειδείς επισκέφηκαν στις 24 Οκτωβρίου Continue reading

European Space Agency :update

Hubble observes a changing exoplanet atmosphere

04-01-2024 04:00 PM CET

An international team of astronomers has assembled and reprocessed observations of the exoplanet WASP-121 b that were collected with the NASA/ESA Hubble Space Telescope in the years 2016, 2018 and 2019. This provided them with a unique dataset that allowed them not only to analyse the atmosphere of WASP-121 b, but also to compare the state of the exoplanet’s atmosphere across several years. 

The team found clear evidence that the observations of WASP-121 b were varying in time. Using sophisticated modelling techniques, they demonstrated that these temporal variations could be explained by weather patterns in the exoplanet's atmosphere.

NASA's Earth Observatory,update

JANUARY 2, 2024 Weekly News

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Cloud Streets Over the Sea of Okhotsk Parallel rows of cumulus clouds streamed from icy domains out over open water.

European Space Agency:update

Face to face with Sun-eclipsing Proba-3

02-01-2024 09:25 AM CET

Through exquisite, millimetre-scale, formation flying, the dual satellites making up ESA’s Proba-3 will accomplish what was previously a space mission impossible: cast a precisely held shadow from one platform to the other, in the process blocking out the fiery Sun to observe its ghostly surrounding atmosphere on a prolonged basis.

 

European Space Agency,update

 It’s all relative

29-12-2023 02:09 PM CET

 Image: It’s all relative

European Space Agency:One million astronomical objects

 One million astronomical objects

26-12-2023 03:30 PM CET

 Video: 00:04:10

Embark on a cosmic journey with ESA as we explore the universe through the lens of ‘One Million’. From the scorching temperatures of the Sun's corona to the cosmic gaze of the NASA/ESA/CSA James Webb Space Telescope — discover the astronomical wonders that surround us. Join our space community in celebrating a momentous occasion — 1 MILLION subscribers on YouTube! Thank you for your enthusiasm and support.

NASA's wonderful world!!

 

DECEMBER 26, 2023

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NASA's Earth Observatory:What's New at the Earth Observatory

DECEMBER 19, 2023

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EUROPEAN SPACE AGENCY, update

Webb rings in the holidays with the ringed planet Uranus
18-12-2023 04:00 PM CET



The NASA/ESA/CSA James Webb Space Telescope recently trained its sights on weird and enigmatic Uranus, an ice giant that orbits on its side. What Webb found is a dynamic world with rings, moons, storms, and other atmospheric features – including a seasonal polar cap. The image expands upon a two-colour version released earlier this year, adding additional wavelength coverage for a more detailed look.


2023: ESA's year in space
18-12-2023 04:00 PM CET

Video: 00:08:22

2023’s highlight was the highly anticipated launch of Juice, Europe’s Jupiter Icy Moon Explorer. The Juice spacecraft was placed on course to Jupiter on the second-to-last Ariane 5 launch vehicle in April. After an eight-year journey, Juice will begin observing the giant gas planet and its three large ocean-bearing moons – Ganymede, Calisto and Europa.

The Euclid space telescope was launched in July with the aim of unravelling the enigmas of ‘dark matter’ and ‘dark energy’. Euclid’s first images were released in November, revealing razor-sharp astronomical images with detail never before seen by a telescope across such a large patch of the sky.

After almost five years in space, ESA’s Aeolus wind mission was retired. This trailblazing mission was tasked with observing wind patterns from space thereby improving weather forecasts and climate models.. Aeolus data and technology will have an important role to play in the accuracy of future weather forecasting. On 28 July, it burned up in an assisted re-entry – the first assisted re-entry by a mission which was not designed to do so.

As space debris becomes an increasingly serious issue, ESA is determined to search for solutions. Together with its commercial and institutional partners, ESA has developed the ‘Zero Debris Charter’, launched this year. By signing the Charter, space entities worldwide can register their intent to work together towards the sustainable use of Earth’s orbital environment.

Earlier in in 2023, MTG-I1, the first of the Meteosat Third Generation missions, sent back its first images. The satellite was launched in 2022 and carries two instruments: a flexible combined imager and a lighting imager. Both instruments performed beyond expectation and a stunning combined image from both was revealed.

Earth observation is key to keeping our planet and the population as a whole, safe. Today, monitoring earthquakes, forest fires or flooding from space already helps to coordinate rescue response but the data can also be used to better understand phenomena such as climate change and support the IPCC climate reports.

Last year, NASA’s Dart mission impacted on a small moonlet of the asteroid Didymos, changing its course. We’ll soon be launching ESA’s Hera spacecraft to collect data on the aftermath of this collision. The Hera spacecraft was integrated and underwent testing this year in ESA ESTEC’s test centre in the Netherlands.

2023 also saw the first hardware tests for the second generation of Galileo satellites but even more importantly the Galileo High Accuracy Service was launched in January. This new service delivers centimetre accuracy from space further cementing Galileo’s reputation as the most accurate satellite navigation system in the world.

Competition: developing Europe's space cargo return service
18-12-2023 02:00 PM CET



ESA is launching a competition which initiates a first phase of activities for European companies to eventually demonstrate a complete cargo delivery service to and from space stations in low-Earth orbit by 2028.
Week in images: 11-15 December 2023
15-12-2023 03:10 PM CET



Week in images: 11-15 December 2023

Discover our week through the lens

NASA's Earth Observatory,update

DECEMBER 12, 2023

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Jasper Heads for Queensland


The first storm of the Australian tropical cyclone season aimed for Port Douglas.

Scars of Ice Age Floods


Outbursts from Glacial Lake Missoula carved the Channeled Scablands in Washington state.

A Busy Season for Hurricanes


Both the Atlantic and eastern Pacific basins were unusually active in 2023—and some storms had unpredictable bouts of rapid intensification.

Athens at Night


Stark contrasts between light and dark indicate the interface between urban and natural areas in the Greek capital.

Green Forests and Dark Skies in Cephalonia


Aínos National Park on Greece's largest Ionian island became a dark sky park in 2023.

Michaung Drenches India's Southeast Coast


The tropical cyclone caused widespread flooding and crop damage in the states of Andhra Pradesh and Telangana.





LATEST IMAGES FROM THE PAST 7 DAYS
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Atmospheric River Flows into the Pacific Northwest


A warm, moisture-laden weather system soaked western Washington and Oregon. (Dec 5, 2023)

Michaung Drenches India's Southeast Coast


The tropical cyclone caused widespread flooding and crop damage in the states of Andhra Pradesh and Telangana. (Dec 5, 2023)

Unrest at Anak Krakatau


This small, unimposing volcano between the Indonesian islands of Java and Sumatra has a destructive past. (Dec 4, 2023)

LATEST IMAGES OF THE DAY
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Green Forests and Dark Skies in Cephalonia


Aínos National Park on Greece's largest Ionian island became a dark sky park in 2023.

Michaung Drenches India's Southeast Coast

The tropical cyclone caused widespread flooding and crop damage in the states of Andhra Pradesh and Telangana.
NASA | 8800 Greenbelt Rd., Greenbelt, MD 20771

NASA's wonderful world!

 

EARTHDATA DISCOVERY OPEN ACCESS FOR OPEN SCIENCE | DECEMBER 2023

From First-Light to First Visualization           Turning the first data collected by NASA’s Tropospheric Emissions: Monitoring of Pollution (TEMPO) instrument into a vivid visualization reveals the pollution-monitoring potential of this space-based sensor.                   NASA air quality data are an integral component in efforts to improve equity and environmental justice in vulnerable communities. Read More                       Articles

Data at the Speed of Light The decommissioning of the Lightning Imaging Sensor (LIS) on the International Space Station marks the end of a nearly 25-year LIS data record of global lightning.           Shedding Light on Ocean Processes Dr. James G. Allen uses NASA optical satellite data to study how visible light interacts with ocean water at both the surface and within the water column. His work is helping to develop processes for better satellite retrievals of ocean parameters.           The Data Behind a Scorching Summer Global temperatures rose into uncharted territory in the summer of 2023. A data-in-action article compares sea surface temperatures from the summer of 2023 to the summer of 2022 to show the influence of warm ocean waters in regions around the world.