Astronomy
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This Week In Space podcast: Episode 168 — "Survivor: NASA"
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California Desert Dunes Hold Keys to Understanding Mars' Shifting Sands
Armed with a drone and a device which is a cross between a scoop and a spatula, a graduate student is cracking the code of Mars by studying California's desert dunes. By comparing wind carved patterns in the Algodones Desert with satellite images of the Red Planet, researchers are creating humanity's first comprehensive database of Martian sand formations, work that could determine where future astronauts can safely establish bases without getting buried alive. Her pioneering research proves that sometimes the keys to exploring alien worlds aren't found in billion dollar space missions, but in the shifting sands right here on Earth.
Are We in a Giant Void? That Would Help Explain the Hubble Tension
It's assumed that our region of the Universe isn't special, and the Hubble Tension, or mismatch of expansion rates of the Universe at different times, is happening everywhere. But what if our place is unusual, for example, if the Milky Way is inside a lower-density region of the Universe, with stronger gravity pulling material away from us in all directions? A new paper suggests we might be in a void that's emptying out towards higher-density regions all around us.
Scientists Discover Uranus Has a Dancing Partner
Hidden in the darkness between Uranus and Neptune, a team of astronomers have discovered a small world locked in a million year gravitational waltz with Uranus. The asteroid enjoying this celestial dance with Uranus completes exactly three orbits for every four of the ice giant, representing the first known stable partnership of its kind in this remote region of the Solar System. The discovery proves that even in the apparent chaos of space, there are elegant mathematical relationships that have persisted, revealing new secrets about how gravitational forces sculpt the architecture of our planetary system.
This is the Closest Picture Ever Taken of the Sun
December 24th, 2024, NASA's Parker Solar Probe made its closest approach to the Sun so far, coming within just 6.1 million km from the surface of the Sun. During this flyby, it captured data and images, including this incredible picture using the Wide Field Imager for Solar Probe, or WISPR. In this WISPR image, you can see the corona and solar wind, charged particles coming from the Sun, hurled across the Solar System. The next pass will happen in September.
Primordial Black Hole Flybys Could Alter Exoplanet Orbits
Close encounters with massive objects can alter the orbits of planets around their stars. Stellar flybys can change planetary orbits, and may be responsible for some of the rogue or free-floating planets astronomers have discovered. But stars aren't the only massive objects out there, and new research suggests that primordial black holes may alter the orbits of exoplanets.