Microscopic, metallic spheres were discovered during a 2023 oceanic expedition.
The BeLaU spherules are a collection of microscopic, metallic spheres enriched in beryllium (Be), lanthanum (La), and uranium (U), discovered during a 2023 oceanic expedition led by Harvard astrophysicist Avi Loeb. This mission aimed to locate remnants of a meteor, designated IM1, which entered Earth’s atmosphere in 2014 and was hypothesized to be of interstellar origin
NORAD has been tracking space debris since the beginning of the space age.
The Kessler Effect, also known as the Kessler Syndrome, was proposed by NASA scientist Donald J. Kessler in 1978. It describes a scenario where the density of objects in low Earth orbit (LEO)[1] is high enough that collisions between objects could cause a cascade effect, creating more debris and increasing the likelihood of further collisions.
The discovery of phosphine on Venus, in 2017, sparked significant scientific debate and renewed interest in the planet’s atmospheric composition.
The presence of phosphine gas in the atmosphere of Venus has been a subject of intense scientific interest and speculation since the late 20th century. Initially, Venus was considered a hostile environment with extreme temperatures and pressures that seemed incompatible with potential biosignatures.
The largest known natural object to have entered Earth’s atmosphere since the Tunguska event in 1908.
The Chelyabinsk meteor was a small asteroid that entered Earth’s atmosphere over the southern Ural region of Russia on February 15, 2013. The event is notable as the largest known natural object to have entered Earth’s atmosphere since the Tunguska event1 in 1908.
The concept is rooted in the fact that dark matter, which makes up about 85% of the universe’s mass, interacts very weakly with electromagnetic forces, making it extremely difficult to detect directly.
The Dark Big Bang Theory is a speculative cosmological model that suggests that, in addition to the known Big Bang that gave rise to visible matter, there was a separate Big Bang associated with dark matter. This model posits that dark matter underwent its distinct process of formation, potentially decoupled from ordinary matter, which could explain its elusive nature.
NASA began supporting the scientific search for technosignatures as part of the larger search for extraterrestrial life.
Technosignatures are indicators or evidence of advanced extraterrestrial civilizations, manifested through various means such as artificial structures, communication networks, or other technological artifacts. The search for technosignatures encompasses a broad range of scientific efforts and methodologies aimed at detecting such signs.
There could be other reasons why we haven’t heard from aliens yet, ranging from us simply not listening for long enough (or not searching for the right signals from aliens, due to our technological immaturity) to aliens deliberately keeping us in a galactic zoo. But if the Great Filter idea is correct, we don’t know what point we are at along it.
The Great Filter is a concept within the field of astrobiology and the Fermi Paradox, which seeks to explain why, despite the vast number of potentially habitable planets in the universe, humanity has not yet detected any signs of extraterrestrial civilizations. This paradox arises from the assumption that if intelligent life is not unique to Earth, then the galaxy should be teeming with advanced civilizations, some of which would have already developed technologies far beyond our current capabilities,
An impact would release energy equivalent to over 1,200 megatons of TNT.
The precise mechanism behind the formation of blue stragglers is not entirely understood.
Blue stragglers are anomalous stars found in star clusters that appear significantly younger and hotter than other stars of the same age and evolutionary stage. Typically, stars in a cluster are expected to evolve off the main sequence at a predictable rate based on their mass. However, blue stragglers appear to have extended their time on the main sequence,
Gravitational lensing occurs when a massive celestial body — such as a galaxy cluster — causes a sufficient curvature of spacetime for the path of light around it to be visibly bent, as if by a lens. The body causing the light to curve is accordingly called a gravitational lens.
Gravitational lenses are one of the most fascinating phenomena predicted by Einstein’s theory of general relativity. Imagine space as a fabric, and massive objects like stars and galaxies as weights pressing down on this fabric, creating curves and warps.
