In the 1990s, Hubble surprised astronomers by revealing just how packed the universe is with galaxies: they estimated some 200 billion of them based on its observations. But now we know these estimates were wrong. There are at least 2 trillion.
Conselice and his team reached this conclusion using deep-space images from Hubble and the already published data from other teams. They painstakingly converted the images into 3-D, in order to make accurate measurements of the number of galaxies at different epochs in the universe's history. In addition, they used new mathematical models, which allowed them to infer the existence of galaxies that the current generation of telescopes cannot observe. This led to the surprising conclusion that in order for the numbers of galaxies we now see and their masses to add up, there must be a further 90 percent of galaxies in the observable universe that are too faint and too far away to be seen with present-day telescopes. These myriad small faint galaxies from the early universe merged over time into the larger galaxies we can now observe.
"It boggles the mind that over 90 percent of the galaxies in the universe have yet to be studied. Who knows what interesting properties we will find when we discover these galaxies with future generations of telescopes? In the near future, the James Webb Space Telescope will be able to study these ultra-faint galaxies, said Conselice.
That's good for about 700 billion trillion stars, and heaven knows how many planets. (Previously)
On Sunday, the SpaceX capsule containing NASA astronauts Bob Behnken and Doug Hurley safely splashed down in the Gulf of Mexico. (Video above.) It was the first time a private company took humans off-world and returned them to Earth and also the first splash-down of American astronauts in 45 years. At a press conference yesterday, […]
WATCH THE SPLASHDOWN EVENT LIVE HERE, the SpaceX video embed in this post will go live with pre-event content sometime before 7pm EDT on Saturday August 1.
NASA launched its latest and greatest rover, Perseverance, to Mars on Thursday, from Cape Canaveral in Florida.
After years of hearing a steady drumbeat about the necessity of surfing the web under the protection of a VPN, even the most technophobic among us are starting to come around. But even knowing the dangers one can face from cybercrooks phishing for information from unsuspecting victims online, those last holdouts still have some fears. […]
You may not realize it, but some of the biggest films in movie history have been edited using the same tools some of you use to cut your video of vacationing at Disney World. Giant movies from Oscar favorites The Social Network and Gone Girl to blockbusters like Avatar, Deadpool, and last year’s Terminator: Dark […]
Now that the initial furor and shortages have subsided, it’s probably not a bad time to start considering your long-term cleaning and disinfecting plans. Sure, that might seem anywhere from overly cautious to outright ridiculous, but the threat of COVID-19 appears poised to be present for a while and the need for quick travel clean-up […]