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The free-fall time is the characteristic time that would take a body to collapse under its own gravitational attraction, if no other forces existed to oppose the collapse.. As such, it plays a fundamental role in setting the timescale for a wide variety of astrophysical processes—from star formation to helioseismology to supernovae—in which gravity plays a dominant ro
At a constant acceleration of 1 g, a rocket could travel the diameter of our galaxy in about 12 years ship time, and about 113,000 years planetary time. If the last half of the trip involves deceleration at 1 g, the trip would take about 24 years. If the trip is merely to the nearest star, with deceleration the last half of the way, it would ...
On April 10, 2020, the Juno spacecraft observed a fireball on Jupiter that was consistent with the impact of a 1–4-meter (3.3–13.1 ft) meteor. It was the first fireball to be detected by Juno . Researchers estimate Jupiter experiences approximately 24,000 impact events of this size per year—around 2.7 per hour.
In science class, we always learned that all the planets in our solar system orbit around the sun. Scientists have figured out this is not necessarily true.
Jupiter radiates more heat than it receives through solar radiation, due to the Kelvin–Helmholtz mechanism within its contracting interior. [70]: 30 [71] This process causes Jupiter to shrink by about 1 mm (0.039 in) per year. [72] [73] At the time of its formation, Jupiter was hotter and was about twice its current diameter. [74]
In September of 2015, physicists made a monumental discovery that opened up a new window to the universe.
Formally, c is a conversion factor for changing the unit of time to the unit of space. [4] This makes it the only speed which does not depend either on the motion of an observer or a source of light and / or gravity. Thus, the speed of "light" is also the speed of gravitational waves, and further the speed of any massless particle.
The European Space Agency's Jupiter Icy Moons Explorer (Juice) is amid its voyage to Jupiter with a scheduled 2031 arrival to study Ganymede and Jupiter's other moons, Callisto and Europa.