High-precision noble gas analyses indicate that solar wind particles from our primordial Sun were encased in the Earth's core over 4.5 billion years ago. Researchers from Heidelberg University have concluded that the particles made their way into the overlying rock mantle over millions of years. The scientists found solar noble gases in an iron meteorite they studied. Because of their chemical composition, such meteorites are often used as natural models for the Earth's metallic core.
New observations reveal that Mars could still be volcanically active, raising the possibility for habitable conditions in the near surface of Mars in recent history. Ongoing research investigates the possibility that the most recent volcanic activity on Mars, which occurred about 50,000 years ago, might have been triggered by a nearby asteroid impact that happened around the same time.
A team of researchers searched for pieces of an asteroid tracked in space and then observed to impact Botswana on June 2018. Guided by SETI Institute astronomer Peter Jenniskens, they found 23 meteorites deep inside the Central Kalahari Game Reserve and have published their findings in the journal Meteoritics and Planetary Science. "Combining observations of the small asteroid in space with information gleaned from the meteorites shows it likely came from Vesta," said Jenniskens.
A new breakthrough astrophysics code, named Octo-Tiger, simulates the evolution of self-gravitating and rotating systems of arbitrary geometry using adaptive mesh refinement and a new method to parallelize the code to achieve superior speeds. This new code to model stellar collisions is more expeditious than the established code used for numerical simulations.
By studying ancient meteorite fragments, scientists can gain important insights into how our solar system formed eons ago. Now, in a new study, researchers have discovered carbon dioxide-rich liquid water inside a meteorite from an asteroid that formed 4.6 billion years ago. This finding suggests that the meteorite's parent asteroid formed beyond Jupiter's orbit before being transported into the inner solar system and provides key evidence for the dynamics of the Solar System's formation.
Every year, our planet encounters dust from comets and asteroids. These interplanetary dust particles pass through our atmosphere and give rise to shooting stars. Some of them reach the ground in the form of micrometeorites. An international program conducted for nearly 20 has determined that 5,200 tons per year of these micrometeorites reach the ground.
The 15-million-year-old Nördlinger Ries is an asteroid impact crater filled with lake sediments. A research team led by the Göttingen University has now discovered a volcanic ash layer in the crater. In addition, they show that the ground under the crater is sinking in the long-term, which provides important insights about craters on Mars, such as those currently being explored by the NASA Curiosity and Perseverance Rovers. Results were in the Journal of Geophysical Research Planets.
The world's first ground-based observations of the bare nucleus of a comet nearing the end of its active life revealed that the nucleus has a diameter of 800 meters and is covered with large grains of phyllosilicate; on Earth large grains of phyllosilicate are commonly available as talcum powder. This discovery provides clues to piece together the history of how this comet evolved into its current burnt-out state.
NASA's OSIRIS-REx mission is on the brink of discovering the extent of the mess it made on asteroid Bennu's surface during last fall's sample collection event. On Apr. 7, the OSIRIS-REx spacecraft will get one last close encounter with Bennu as it performs a final flyover to capture images of the asteroid's surface.
A research team of international space scientists, led by Dr Matthias van Ginneken from the University of Kent's School of Physical Sciences, has found new evidence of a low-altitude meteoritic touchdown event reaching the Antarctic ice sheet 430,000 years ago.