An asteroid buzzed by Earth on Wednesday, coming within 25,000 miles of our planet. That may not sound like a close call but — given the massive scale of the universe — it is. In a press release, NASA points out that the asteroid’s distance to Earth was 1/10th the distance of the Earth to the moon.
As asteroid 2016 RB1 passed under the Earth’s south pole, it didn’t disrupt communication or weather satellites, which orbit Earth a little over 22,000 miles away. If it weren’t for careful inspection from a team of astronomers at the Catalina Sky Survey, we may not have even noticed it.
The asteroid, 2016 RB1, was discovered on Monday by astronomers using the 60-inch Cassegrain reflector telescope positioned at the top of Mount Lemmon in the Santa Catalina Mountains near Tucson, Arizona. At 25 to 50 feet in diameter, 2016 RB1 is a fraction of the size of the largest asteroid to pass near Earth this year, 2016 FN56, which has a diameter between 115 and 280 feet.
NASA keeps a tally of all known asteroids as a part of its Near-Earth Object Program, which let’s scientists and members of the public track these space rocks. We’ll be visited by 2016 RB1 again but it won’t come as close to Earth as it did Wednesday for at least another 50 years, according to NASA.
Many scientists have a special interest in asteroids as ancient objects that offer insight into the formation of our solar system.
On Thursday night, NASA commenced a 7-year mission by launching OSIRIS-REx, a probe that will travel to a near-Earth asteroid named Bennu, where it will suck up dust samples and return them to Earth for observations. The agency is also working on the Asteroid Redirect Mission (ARM), which will see a spacecraft rendezvous with an asteroid, collect a boulder, and attempt to gently deflect the asteroid’s trajectory before returning to Earth. This maneuver, called a planetary defense demonstration, may one day help knock an inbound asteroid off its path toward Earth.
After 13 suborbital test flights and more than $15 billion in development costs, SpaceX's Starship has finally reached orbit. The 407-foot megarocket, the most powerful ever built, lifted off from Starbase, Texas, on Monday and delivered its first real payload on it's 14th attempt. The celebration came with an asterisk, though, since SpaceX had to cut the planned 10-hour mission to roughly three hours.
https://twitter.com/SpaceX/status/2104601695711904180
SpaceX is finally ready to give Starship its biggest test yet. The company says the massive rocket's 14th test flight is scheduled for September 22, when it will attempt to put the upper stage into Earth orbit for the first time. The launch is currently pending regulatory approval, with a 75-minute window opening at 7:15 a.m. CT.
Starship has 26 Starlink satellites to deliver
For decades, humanity has looked up at the Moon and wondered what it would be like to live on it. Think sprawling cities, factories, research centers, and permanent human settlements. Unfortunately, there is one fairly fundamental problem with that vision.
A new study published in Frontiers in Space Technologies argues that even the Moon's potentially enormous reserves of frozen water may be nowhere near enough to support city-sized populations sustainably. Researchers Martin Elvis and Jonathan McDowell estimate that the permanently shadowed regions near the lunar poles could contain roughly one billion tons of water. It sounds like an extraordinary amount until you put a million thirsty humans next to it.