High-energy Venus Impacts
An SwRI-led team compared the early impact history of Venus and Earth, determining that Venus experienced higher-energy impacts that created a superheated core. Models show these conditions could create Venus’ extended volcanism and younger surface.
Evolution of Terrestrial Planets
A new SwRI-led paper highlights the scientific progress made in understanding the evolution of terrestrial planets, including the effects of late large impacts on pre-existing modes of tectonics. For instance, the Earth experienced transient subduction, when one tectonic plate slides beneath another. Because Venus’ surface is covered by a single plate, a high-velocity impact led to a superheated core and long-lived volcanism. On Mars, a large, low-velocity impact facilitated variations in its hemispheres. Impacts also modify the atmospheres of terrestrial planets in profound ways, including eliminating or supplementing existing gases.
A new SwRI-led paper highlights the scientific progress made in understanding the evolution of terrestrial planets, including the effects of late large impacts on pre-existing modes of tectonics. For instance, the Earth experienced transient subduction, when one tectonic plate slides beneath another. Because Venus’ surface is covered by a single plate, a high-velocity impact led to a superheated core and long-lived volcanism. On Mars, a large, low-velocity impact facilitated variations in its hemispheres. Impacts also modify the atmospheres of terrestrial planets in profound ways, including eliminating or supplementing existing gases.
Creationist myths describe Earth as a flat world under a dome at the centre of the Universe, made just a few thousand years ago. The real story is far more extraordinary: a fragile chain of chance events and natural forces that made life possible on this small rocky planet.
Earth orbits an ordinary star on the edge of the Milky Way, one of billions in one of trillions of galaxies. That it exists at all is down to gravity, physics, and luck. Out of this came a beautiful world teeming with life—including one species able to marvel at the Universe and ask how it all began, and in it's fearful, ignorant infancy, make up the myths to explain it that now pass for science in some scientifically backward cultures.
One early collision with a smaller planetoid gave us the Moon, tides, and seasons; this or a later impact may, according to this study, be responsible for tectonic plates, giving us a forever changing, dynamic planet, driving evolutionary divergence. While not required for life to appear, these events shaped the planet into the diverse, life-rich world we know today.













































