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.

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.

Want a last minute steal? Save $200 on this pro-level Sony A7R IV mirrorless camera as Walmart takes on Amazon

Prime Day is brilliant, but the best savings aren’t always at Amazon. Walmart has beaten the online giant’s price for this Sony A7R IV camera, by over $200, but it could be ending soon! Continue ReadingWant a last minute steal? Save $200 on this pro-level Sony A7R IV mirrorless camera as Walmart takes on Amazon

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.

Funding Astrobiology Challenges Can Bring Us Closer To Understanding the Origins of Life

Astrobiology can be split into two very distinct fields. There’s the field that astronomers are likely more familiar with, involving large telescopes, exoplanets, and spectroscopic signals that are pored over to debate whether they show signs of life. But there is another camp, collective known as the Origins researchers that focus on developing a scientific understanding of how life originally developed on Earth. A new paper from Cole Mathis at Arizona State and Harrison B. Smith at the Institute of Science in Tokyo suggests a new path forward to tackling those challenges – set them up as competitions and let a hefty prize motivate scientific teams and individuals to pursue them.

Ancient Rivers in Noachis Terra Reveal Mars’ Long-Lived Wet Past

In the last couple of decades, evidence has accumulated showing that ancient Mars was a warm planet with abundant water flowing across its surface. The more scientists study the planet, the more evidence they find. New research examining Mars’ Noachis Terra region adds to this evidence, showing that flowing water was once widespread across this less-often studied region.

Spotting New Interstellar Comet C/2025 N1 ATLAS

It’s the question of the hour. On the first day of the month July 1st, the Asteroid Terrestrial-impact Last Alert System (ATLAS) station at Río Hurtado, Chile spotted an interstellar interloper, which would receive the official designation C/2025 N1 ATLAS or 3I/ATLAS. The ‘I’ is a rare ‘interstellar’ designation, only the third such object known of after 1I/ʻOumuamua and 2/I Borisov. But can we see it? Such a spectacle as actually seeing an interstellar comet would be a true rarity to cross off your skywatching life list.

Rocket Report: SpaceX to make its own propellant; China’s largest launch pad

Welcome to Edition 8.02 of the Rocket Report! It’s worth taking a moment to recognize an important anniversary in the history of human spaceflight next week. Fifty years ago, on July 15, 1975, NASA launched a three-man crew on an Apollo spacecraft from Florida and two Russian cosmonauts took off from Kazakhstan, on course to link up in low-Earth orbit two days later. This was the first joint US-Russian human spaceflight mission, laying the foundation Continue ReadingRocket Report: SpaceX to make its own propellant; China’s largest launch pad