segunda-feira, 30 de junho de 2014

Galaxy Cove Vista Revisited

Sun's atmosphere is more enormous than we thought

NASA scientists have calculated that the Sun's atmosphere extends some 8 million kilometres above its surface. That's 20 times the distance between the Earth and the Moon.
This figure, which is the equivalent of 12 solar radii, was determined using information from NASA's Solar Terrestrial Relations Observatory, or 'STEREO'. STEREO is a solar observation mission that launched two almost identical spacecraft in 2006 to orbit around the Sun and provide stereoscopic imaging of its activities, including coronal mass ejections and solar flares. In 2011, these two spacecraft managed to position themselves exactly 180 degrees apart, which allowed scientists to view the entire Sun all at once for the first time. Read more.

segunda-feira, 23 de junho de 2014

Time travel has been simulated by Australian physicists

Physicists at the University of Queensland in Australia have used photons - single particles of light - to simulate quantum particles travelling through time and study their behaviour.
They were hoping to find out more about whether time travel would be possible at the quantum level - a theory first predicted in 1991.
In the study, the researchers simulated the behaviour of a single photon that travels through a wormhole and interacts with its older self. This is known as a closed timelike curve - a closed path in space-time that returns to the same starting point in space but at an earlier time. Their study is published in Nature Communications. Read more.

sábado, 21 de junho de 2014

Lisbon Honey Moon

quarta-feira, 18 de junho de 2014

There’s a scientific reason your iPhone headphones are always tangled

Researchers have identified the factors that increase the probability of your headphones knotting.
It turns out, it all comes down to the length of the wire and the amount of “agitation” it's subjected to, as Jim Edwards reports for Business Insider.
When these two factors are plotted against each other, scientists are able to see a curve that reveals the likelihood of headphones getting tangled up. Read more.

Scientists Finally Unlock The Secrets Behind Superconductivity

Scientists from the University of Cambridge believe they have solved the longstanding mystery of where superconductivity emerges in high-temperature superconductors. Equipped with this knowledge, scientists may be able to tap into the astronomical potential of these materials which could have applications in a wide variety of technologies, from magnetic levitating trains to supercomputers. Read more.

terça-feira, 17 de junho de 2014

5 Sky Events This Week: Goddess of Love and Distant Giants

A legendary symbol of beauty adds romance to the early morning skies this week, appearing along with some of the most elusive of Earth’s neighboring worlds. 
Venus, the Morning Star: Starting at dawn on Tuesday, June 17, and for the rest of this week, look for the diamond-like Venus to appear in the eastern sky.  The brightest starlike object in the morning sky, Venus will rise about 90 minutes before dawn. The planet will hang about 10 degrees above the horizon within a half hour before sunrise. Read more.

domingo, 15 de junho de 2014

Hubble: Timelapse of V838 Monocerotis (2002-2006)

  In January 2002, astronomers discovered a massive explosion coming from V838 Monocerotis. They initially thought they were witnessing a supernova, but after the initial flash of light began to dim (as expected), it began to brighten again in infrared wavelengths at the beginning of March. After that brightening faded, another one happened in April. While astronomers were certain they weren’t witnessing a supernova, they weren’t quite sure what it actually was. Read more.

55 Year Old Mystery About The Dark Side Of The Moon Solved

Huge Underground "Ocean" Discovered Towards Earth's Core

Water is what gives our planet its beautiful blue color and is critical for the existence of life as we know it. Our entire planet is nicknamed after it - the "blue planet", or "pale blue dot". A new study led by geophysicist Steve Jacobsen of Northwestern University and seismologist Brandon Schmandt from the University of New Mexico has yielded evidence that vast oceans worth of water are tied up within Earth’s mantle. The results are published in Science.

segunda-feira, 9 de junho de 2014

quarta-feira, 4 de junho de 2014

Godzilla, um planeta rochoso 17 vezes mais maciço do que a Terra

Foi descoberto um novo tipo de planeta extra-solar: um mega-planeta rochoso que tem 17 vezes a massa da Terra e que poderá mudar a nossa compreensão sobre o início do Universo. Como é muito maior do que as super-Terras que têm vindo a ser encontradas à volta de outras estrelas que não o nosso Sol, os cientistas puseram-lhe o nome do rei dos monstros – Godzilla.
Este planeta de composição sólida rochosa, situado a 560 anos-luz de distância da Terra, foi detectado pelo telescópio espacial Kepler, lançado em 2009 pela agência espacial norte-americana NASA, anunciou a equipa responsável pela descoberta numa conferência de imprensa durante uma reunião da Sociedade Americana de Astronomia, em Boston (EUA). Ler mais.

Whirlpool Galaxy

The image, made by NASA's Hubble Space Telescope, shows the Whirlpool Galaxy (also known as M51 and NGC 5194) in the optical waveband.

The image, made by NASA's Chandra X-ray Observatory, shows the same galaxy in the x-ray waveband. The bright point sources in the Chandra image correspond to binary stars made up of neutron stars or black holes that are sucking material away from their companion stars. The diffuse emission in Chandra image comes from interstellar plasma that has been superheated by supernova explosions. More info.

domingo, 1 de junho de 2014

TED Talks with Stephen Hawking: Questioning the universe

In keeping with the theme of TED2008, professor Stephen Hawking asks some Big Questions about our universe — How did the universe begin? How did life begin? Are we alone? — and discusses how we might go about answering them. 

NASA Plans To Send People To Mars By 2035

NASA has recommitted itself to landing humans on Mars by 2035, but has admitted that this is a project that will require the world to work together. NASA's chief scientist Ellen Stofan gave a talk to the Royal Institution in London a fortnight ago, and video of the talk has now been released. "This is not something any one nation can do on their own," Stofan said. "It's something that humanity is going to do together." 
Stofan sees a Mars mission as a crucial part of the quest to answer the three questions she says turn up repeatedly in NASA's goals: “Are we alone, how did we get here and how does the universe work.” Mars is particularly important for answering the other two, she argued, although she also talked about the potential for life on Europa and EnceladusRead more.