Starts With a Bang! 20 Sep 2019, 14:01 UTC Whenever you set out to solve a problem, there are a series of steps you have to take in order to arrive at the answer. Assuming your methods are sound and you don’t make any major errors, the answer you get should be correct. It might be a little higher or a little lower that the “true” value, as measurement (and other) uncertainties are real and cannot be eliminated, but the answer you obtain should be independent of the method you use.
New Scientist 20 Sep 2019, 12:56 UTC Stars sometimes bite off more than they can chew. When a star devours a planet, it can have strange effects on the star, including causing it to start falling apart. Understanding those effects could help us figure out how different kinds of planetary systems are formed.
ESO Blog 20 Sep 2019, 10:00 UTC ESO’s Very Large Telescope (VLT) is the world’s most advanced optical and infrared astronomical observatory and observes objects four billion times fainter than the naked eye can see. But what is it like to spend a night deep in the Atacama Desert observing the stars with the VLT? How does it feel to control such a machine? Cyrielle Opitom, an ESO Fellow resident in Chile, describes one of her shifts observing the night sky with this formidable machine.
astrobites 20 Sep 2019, 09:03 UTC The effect of dark matter on galaxies was first observed back in the 1920s by various astronomers. When studying the rotation of the outer parts of the galaxy, they could see it was going much faster than it should be given the mass of the galaxy (estimated from the light emitted by the stars). It was therefore inferred that there must be more mass in the galaxy that we can’t see. Moreover, it wasn’t just a little bit of mass that we couldn’t see, it was 5 times the mass of the visible stars within the galaxy.
David Reneke's World of Space and Astronomy 19 Sep 2019, 20:08 UTC The smaller of Mars’ two moons, Deimos, was named after the Greek god of terror — but the way former NASA flight surgeon Jim Logan sees it, Deimos could be a comfort zone for space settlers.
Universe Today 19 Sep 2019, 18:15 UTC The JunoCam onboard NASA’s Juno spacecraft continues to provide we Earthbound humans with a steady stream of stunning images of Jupiter. We can’t get enough of the gas giant’s hypnotic, other-worldly beauty. This image of Io passing over Jupiter is the latest one to awaken our sense of wonder.
SciTech Daily 19 Sep 2019, 07:47 UTC Galaxies come in a wide variety of shapes, sizes, and brightnesses, ranging from humdrum ordinary galaxies to luminous active galaxies. While an ordinary galaxy is visible mainly because of the light from its stars, an active galaxy shines brightest at its center, or nucleus, where a supermassive black hole emits a steady blast of bright light as it voraciously consumes nearby gas and dust.
Spaceflight Now 19 Sep 2019, 07:46 UTC Fresh images from NASA’s Juno spacecraft show an ethereal shadow cast by Jupiter’s volcanic moon Io on the planet’s swirling cloud tops. The JunoCam imager captured views of Io’s distinct shadow on Jupiter during its most recent passage near the giant planet, and skilled amateur image analysts immediately set to work processing the data into dazzling renderings showing a black circle amid Jupiter’s churning clouds.