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Kinetic impactors such as the one used by the Double Asteroid Redirection Test – its impact with the asteroid moon Dimorphos photographed above – are one of many methods designed to alter the trajectory of an asteroid to prevent its potential collision with Earth. Damage caused by the Tunguska event. The object was 50–80 meters (160–260 ...
Impact events earlier in the history of Earth have been credited with creative as well as destructive events; it has been proposed that impacting comets delivered the Earth's water, and some have suggested that the origins of life may have been influenced by impacting objects by bringing organic chemicals or lifeforms to the Earth's surface, a ...
Moving Earth is a theoretical astroengineering concept that involves physically shifting Earth farther away from the Sun to protect the planet's biosphere from rising temperatures. These expected temperature increases derive from long-term impacts of the greenhouse effect combined with the Sun's nuclear fusion process and steadily increasing ...
So maybe it’s best we leave Saturn exploration to uncrewed probes after all. In 2017, NASA’s Cassini probe sent us our closest view of Saturn to date. If you wanted to take a closer look at ...
Planets are pushed around the Sun by a force from the Sun. This false assumption relies on incorrect Aristotelian physics that an object needs to be pushed to maintain motion. The propelling force from the Sun is inversely proportional to the distance from the Sun. Kepler reasoned this, believing that gravity spreading in three dimensions would ...
The upper limit for crewed return to Earth from low Earth orbit (LEO) or lunar return is 10g. [68] For Martian atmospheric entry after long exposure to zero gravity, the upper limit is 4 g . [ 68 ] Peak dynamic pressure can also influence the selection of the outermost TPS material if spallation is an issue.
In astronomy, perturbation is the complex motion of a massive body subjected to forces other than the gravitational attraction of a single other massive body. [1] The other forces can include a third (fourth, fifth, etc.) body, resistance, as from an atmosphere, and the off-center attraction of an oblate or otherwise misshapen body.
In 1993 numerical simulations suggested that the Moon is necessary to keep the Earth's axial tilt stable. Without the Moon the axial tilt of Earth could therefore oscillate chaotically from 0° to 45° on the scale of tens of thousands of years, possibly reaching 85° on timescales of several million years, [11] with severe climatic consequences.