20% of the surface of Earth’s Eastern Hemisphere is littered with a certain kind of rock. Black, glossy blobs called tektites are spread throughout Australasia. Scientists know they’re from a meteorite strike, but they’ve never been able to locate the crater where it struck Earth.
Now a team of scientists seems to have found it.
Continue reading “Almost 800,000 Years Ago, an Enormous Meteorite Struck Earth. Now We Know Where.”
Astronomers have been watching a nearby pulsar with a strange halo around it. That pulsar might answer a question that’s puzzled astronomers for some time. The pulsar is named Geminga, and it’s one of the nearest pulsars to Earth, about 800 light years away in the constellation Gemini. Not only is it close to Earth, but Geminga is also very bright in gamma rays.
Continue reading “Halo Around a Pulsar could Explain Why We See Antimatter Coming from Space”
There are a number of health risks that come with going to space. Aside from the increased exposure to solar radiation and cosmic rays, there are the notable effects that microgravity can have on human physiology. As Scott Kelly can attest, these go beyond muscle and bone degeneration and include diminished organ function, eyesight, and even changes at the genetic level.
Interestingly enough, there are also a number of potential medical benefits to microgravity. Since 2014, Dr. Joshua Choi, a senior lecturer in biomedical engineering at the University of Technology Sydney, has been investigating how microgravity affects medicine and cells in the human body. Early next year, he and his research team will be traveling to the ISS to test a new method for treating cancer that relies on microgravity.
Continue reading “Cancer Seems to Have Trouble Spreading in Microgravity”
In recent years research into extremophiles has captured the interest of astrobiologists. The discovery of lifeforms in some of Earth’s most extreme environments has helped shape our thinking about extraterrestrial life. Life on other worlds may not need the kind of temperate, balanced environment that most life on Earth is adapted to.
Continue reading “Finally! Scientists Find a Place on Earth with Liquid Water But No Life”
When it comes to plans for future missions to space, one of the most important aspects will be the use of local resources and autonomous robots. This process is known as In-Situ Resource Utilization (ISRU), which reduces the amount of equipment and resources that need to be sent ahead or brought along by a mission crew. Meanwhile, autonomous robots can be sent ahead of a crew and have everything prepared for them in advance.
But what about bacteria that can draw iron from extraterrestrial soil, which would then be used to 3D print metal components for a base? That is the idea that is being proposed by PhD candidate Benjamin Lehner of the Delft University of Technology. On Friday (Nov. 22nd), he defended his thesis, which calls for the deployment of an uncrewed mission to Mars that will convert regolith into useable metal using a bacteria-filled bioreactor.
Continue reading “Using Bacteria to Build a Base on Mars”
What’s been long-suspected has now been confirmed: Jupiter’s moon Europa has water. As we’ve learned more about the outer Solar System in recent years, Europa has become a high-priority target in the search for life. With this discovery, NASA has just painted a big red bulls-eye on Jupiter’s smallest Galilean moon.
Continue reading “Water Vapor Was Just Found on Europa, More Evidence There’s Liquid Water Beneath All that Ice”
There’s a disturbing lack of hibernation in our space-faring plans. In movies and books, astronauts pop in and out of hibernation—or stasis, or cryogenic sleep, or suspended animation, or something like it—on a regular basis. If we ever figure out some kind of hibernation, can we take advantage of it to get by with smaller spacecraft?
The European Space Agency (ESA) is working to answer that question.
Continue reading “If Astronauts Hibernated on Long Journeys, They’d Need Smaller Spacecraft”
Only two of humanity’s spacecraft have left the Solar System: NASA’s Voyager 1 and Voyager 2. Voyager 1 left the heliosphere behind in 2012, while Voyager 2 did the same on Nov. 5th, 2018. Now Voyager 2 has been in interstellar space for one year, and five new papers are presenting the scientific results from that one year.
Continue reading “What Voyager 2 Learned After Spending a Year in Interstellar Space”
Dark Energy is the mysterious force driving the expansion of the Universe. We don’t know what dark energy is, even though it makes up about 68% of the Universe. And the expansion is accelerating, which only adds to the mystery.
A new instrument called the Dark Energy Spectroscopic Instrument (DESI) will study dark energy. It’s doing so with 5,000 new robotic “eyes.”
Continue reading “New Telescope Instrument Will Watch the Sky with 5,000 Eyes”
Pluto was discovered in 1930 by astronomer Clyde Tombaugh. For decades, not much detail was known about the erstwhile planet. We assumed it was a frozen, dormant world.
Continue reading “New Horizons Team Pieces Together the Best Images They Have of Pluto’s Far Side”