Tidal tails — The beginning of the end of an open star cluster

Tidal tails — The beginning of the end of an open star cluster

In the course of their life, open star clusters continuously lose stars to their surroundings. The resulting swath of tidal tails provides a glimpse into the evolution and dissolution of a star cluster. Thus far only tidal tails of massive globular clusters and dwarf galaxies have been discovered in the Milky Way system. In open…

Here’s how NASA is searching for all the missing mass in the Universe

Here’s how NASA is searching for all the missing mass in the Universe

Centuries of astronomical observation and technological advances have revealed a lot about the Universe we all call home, but it’s also raised plenty of new questions. Researchers have crunched a lot of numbers to try to make sense of the Big Bang and the billions of years that followed, but something just isn’t adding up.…

It’s Official: NASA Says Mars Rover Opportunity Is Dead

It’s Official: NASA Says Mars Rover Opportunity Is Dead

One of the last images sent back by Opportunity, with dust obscuring the camera lens, taken on June 10, 2018.NASA declared at a press conference today that its Opportunity rover is officially no longer functional, marking the end of an era while celebrating the wildly successful Mars Exploration Rover (MER) mission. The Mars Exploration Rover…

Stuff The Internet Says On Scalability For February 15th, 2019

Stuff The Internet Says On Scalability For February 15th, 2019

FridayFeb152019 Stuff The Internet Says On Scalability For February 15th, 2019 Friday, February 15, 2019 at 9:02AM Wake up! It's HighScalability time: Do you like this sort of Stuff? I'd greatly appreciate your support on Patreon. Know anyone who needs cloud? I wrote Explain the Cloud Like I'm 10 just for them. It has 39 mostly…

Should I buy the Sony a6400? Here’s how it compares

Should I buy the Sony a6400? Here’s how it compares

This week, Sony introduced its newest APS-C camera, the a6400. Of course, Chris and Jordan were on hand to take it for a spin and test out all the new features.The Sony a6400 is, in many ways, just a refreshed a6300, but its overhauled AF system makes a big difference. We look at how it…

Satellite to offer ‘shooting stars on demand’

Satellite to offer ‘shooting stars on demand’

The first demonstration is planned for 2020. Image Credit: CC BY 2.0 Joshua Tree National Park A Japanese startup has launched a satellite in a bid to create the first ever artificial meteor shower. Launched from the Uchinoura Space Center by the Japanese Aerospace Exploration Agency (JAXA) on Friday, the satellite is part of efforts…

Gravitational waves: Black hole detector to get upgrade

Gravitational waves: Black hole detector to get upgrade

Image copyright NSF Image caption The LIGO Louisiana lab that detected gravitational waves is in line for an upgrade The UK and US governments will spend £25m upgrading the machines that made the historic first detection of gravitational waves in 2015. The improved instruments will be able to sense collisions of black holes nearly twice…

Action Principle for Newtonian Gravity

Action Principle for Newtonian Gravity

Abstract We derive an action whose equations of motion contain the Poisson equation of Newtonian gravity. The construction requires a new notion of Newton-Cartan geometry based on an underlying symmetry algebra that differs from the usual Bargmann algebra. This geometry naturally arises in a covariant 1/c expansion of general relativity, with c being the speed…

15 Gripping Facts About Galileo

15 Gripping Facts About Galileo

Albert Einstein once said that the work of Galileo Galilei “marks the real beginning of physics.” And astronomy, too: Galileo was the first to aim a telescope at the night sky, and his discoveries changed our picture of the cosmos. Here are 15 things that you might not know about the father of modern science,…

Opinion: The instrument that spots killer asteroids and star-eating black holes

Opinion: The instrument that spots killer asteroids and star-eating black holes

Don Lincoln is a senior scientist at Fermi National Accelerator Laboratory. He is the author of "The Large Hadron Collider: The Extraordinary Story of the Higgs Boson and Other Stuff That Will Blow Your Mind" and produces a series of science education videos. Follow him on Facebook. The opinions expressed in this commentary are his.…