Universe Today 30 May 2021, 17:19 UTC When you think of a space telescope, you probably think of ones such as the Hubble, which probes deep space using precision optics. But optical space telescopes are also pointed at Earth, giving us detailed views of everything from weather, to traffic patterns, to the movement of military troops. While Earth-focused telescopes are extremely useful, they can also be fairly large and expensive to launch into space. But that could change with a new proposed design for cube satellites.
SciTech Daily 30 May 2021, 10:35 UTC Which are the inner regions of the Sun and how do they work?
Centauri Dreams 28 May 2021, 17:08 UTC The usual course of the discussion about planet habitability assumes that the planet is in the habitable zone (HZ), probably in the continuously habitable zone (CHZ). The determination if the planet is inhabitable concerns the necessary composition and pressure of the atmosphere to maintain a surface temperature able to support liquid water. As stars usually increase their luminosity over time, we see charts like the one below for Earth showing the calculated range of average surface temperature. Atmospheric pressure and composition can be modified to determine the inner and outer edges of the HZ or CHZ.
The Planetary Society Blog 28 May 2021, 14:30 UTC The Sun is temperamental, to say the least. This split image shows the striking difference between an active Sun (seen on the left during the April 2014 solar maximum) and a quiet Sun (seen on the right during the December 2019 solar minimum). Scientists predict the Sun’s activity will once again ramp up to a maximum in 2025. Learn more about what this means and how it could affect life on Earth.
Unprecedented New Panorama of the Center of Our Milky Way – Reveals Magnetized Threads Weaving Spectacular Galactic Tapestry27 May 2021, 18:44 UTC Threads of superheated gas and magnetic fields are weaving a tapestry of energy at the center of the Milky Way galaxy. A new image of this new cosmic masterpiece was made using a giant mosaic of data from NASA’s Chandra X-ray Observatory and the MeerKAT radio telescope in South Africa.
Centauri Dreams 27 May 2021, 15:23 UTC What’s going on on the floor of Europa’s ocean? It’s hard to imagine a place like this, crushed under the pressure of 100 kilometers or more of water, utterly dark, although I have to say that James Cambias does wonders with an ice moon ocean in his novel A Darkling Sea (Tor, 2014). Science fiction aside, Europa Clipper is in queue for a 2024 launch, and we can anticipate a flurry of new studies that feed into plans for the mission’s scientific investigations. The latest of these puts Clipper on volcano watch.
Scientific American 27 May 2021, 14:00 UTC Scientists lost one of their best tools with the demise of the Arecibo telescope.
Why the Sun’s Atmosphere Is Hundreds of Times Hotter Than Its Surface – 80 Year-Old Theory Finally Confirmed27 May 2021, 03:03 UTC The visible surface of the Sun, or the photosphere, is around 6,000°C. But a few thousand kilometers above it – a small distance when we consider the size of the Sun – the solar atmosphere, also called the corona, is hundreds of times hotter, reaching a million degrees celsius or higher.