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Reposted fromlimon limon
Good-Night John Glenn. You were the original badass
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NASA - Astronomy Picture of the Day 2016-12-07 // Filaments around a Black Hole
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Can a Wood Heat Shield Really Work?
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NASA - Astronomy Picture of the Day 2016-12-05 // Lightning over Colorado
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Introducing Amazon Go and the world’s most advanced shopping technology
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NASA Picture of the day 2016-12-01
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The critical geometry of a thermal big bang
by Niayesh Afshordi & Joao Magueijo
arxiv.org/abs/1603.03312, vs.2 (8 Nov 2016)


We explore the space of scalar-tensor theories containing two non-conformal metrics, and find a discontinuity pointing to a “critical” cosmological solution. Due to the different maximal speeds of propagation for matter and gravity, the cosmological fluctuations start off inside the horizon even without inflation, and will more naturally have a thermal origin (since there is never vacuum domination). The critical model makes an unambiguous, non-tuned prediction for the spectral index of the scalar fluctuations: nS = 0.96478(64). Considering also that no gravitational waves are produced, we have unveiled the most predictive model on offer. The model has a simple geometrical interpretation as a probe 3-brane embedded in an EAdS2 × E3 geometry.
Reposted fromArchimedes Archimedes
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Emergent Gravity and the Dark Universe
by Erik Verlinde
arxiv.org/abs/1611.02269 (8 Nov 2016)


Recent theoretical progress indicates that spacetime and gravity emerge together from the entanglement structure of an underlying microscopic theory. These ideas are best understood in Anti-de Sitter space, where they rely on the area law for entanglement entropy. The extension to de Sitter space requires taking into account the entropy and temperature associated with the cosmological horizon. Using insights from string theory, black hole physics and quantum information theory we argue that the positive dark energy leads to a thermal volume law contribution to the entropy that overtakes the area law precisely at the cosmological horizon. Due to the competition between area and volume law entanglement the microscopic de Sitter states do not thermalise at sub-Hubble scales: they exhibit memory effects in the form of an entropy displacement caused by matter. The emergent laws of gravity contain an additional `dark' gravitational force describing the `elastic' response due to the entropy displacement. We derive an estimate of the strength of this extra force in terms of the baryonic mass, Newton's constant and the Hubble acceleration scale a0 = c H0, and provide evidence for the fact that this additional `dark gravity~force' explains the observed phenomena in galaxies and clusters currently attributed to dark matter.
Reposted fromArchimedes Archimedes
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The Most Gruesome Parasites – NTDs Explained
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Blind Man Gets Bionic Glasses, Sees Wife For First Time In 10 Years
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TMRO 9.38 - Low Earth Orbit Airships

We are joined by John Powell, founder of JPAerospace. 6 years ago we interviewed John on Spacevidcast (now TMRO) and it is fun to see the progress since then. John has an interesting idea for what could be one of the safest ways to get humans to Low Earth Orbit. If he can get balloons moving fast enough!

In Space News we have:
  • Ariane 5 and Soyuz Launches
  • Goes-R Upcoming Launch
  • Shenzhou 11 crew returns to Earth
  • MESSENGER data finds massive valley on Mercury
  • SpaceX tests Fuel Tanks for ITS at sea
  • New evidence supports a subsurface ocean in Pluto
  • Vector Space raises additional funds
Reposted fromeglerion eglerion
Reposted fromeglerion eglerion
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Arctic Sea Ice Minimum Volumes 1979-2016

This is an animated visualization of the startling decline of Arctic Sea Ice, showing the minimum volume reached every September since 1979, set on a map of New York with a 10km grid to give an idea of scale. It is clear that the trend of Arctic sea ice decline indicates that it'll soon be ice-free for an increasingly large part of the year, with consequences for the climate.

The rate of ice loss in the Arctic is staggering. Since 1979, the volume of Summer Arctic sea ice has declined by more than 80% and accelerating faster than scientists believed it would, or even could melt. [...]

About the data: Sea Ice Volume is calculated using the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS, Zhang and Rothrock, 2003) developed at APL/PSC. Source data for this graph is available from http://psc.apl.washington.edu/research/projects/arctic-sea-ice-volume-anomaly/
Reposted fromeglerion eglerion
I've hesitated for the past days to post this chart, simply because it's so extraordinary, and requires at least some more corroboration than twitter replies. Now Kaitlyn Tiffany wrote a post on The Verge with a good summary of what's going on. Yes, the data is real, the chart seems to be correct. The only debatable issue seems to be whether it is scientifically helpful to combine arctic and antarctic measurements of sea ice areas, which are as independent as they can be on a planet - but it's still the same planet, undergoing rapid global environmental changes currently.
Reposted fromeglerion eglerion
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