Robin Canup came to the moon problem from studies
of planetary rings such as those girding the gas giants.
The scientists» findings could help to increase the understanding of the basic properties of granular gases such as soot agglomeration in flue gases on Earth or in astrophysical phenomena such as cosmic dust in
planetary rings in space.
The world's first internal tooth shaving process offers enhanced
planetary ring gear precision, minimising transmission noise.
Your story
on planetary rings and moon formation (8 December, p 18) is interesting, but Earth's moon seems too massive...
Six of the eight planets are orbited by natural satellites (moons) after Earth's Moon and each of the outer planets is encircled
by planetary rings of dust and other particles.
Some of them, such as Saturn, Jupiter, Uranus and Neptune, additionally
possess planetary rings — a collection of still smaller bodies of different sizes that also orbit a planet.
It wouldn't be so surprising that we are witnessing Saturn's spectacular display right now
if planetary rings were popping up all the time, but they are not.
Haumea is a much larger object further out in the solar system, and together with the centaurs can help scientists learn more
about planetary rings in general, writes Amanda A. Sickafoose, astronomer at MIT and the South African Astronomical Observatory, in a Nature commentary.
The new data from the Cassini mission allows them to better understand
how planetary rings behave and to apply that knowledge to previously gathered data from Voyager 2.
Chancia and Hedman are well - versed in the physics
of planetary rings: both study Saturn's rings using data from NASA's Cassini spacecraft, which is currently orbiting Saturn.
Researchers shed light on scientific phenomenon which helps to better understand evolution of interstellar dust and
planetary rings in space
Both Chancia and Hedman are experts
on planetary rings, as they study Saturn's rings using data from NASA's Cassini spacecraft.
In other words, it is generic for
all planetary rings which have particles to have a similar nature.»
In a breakthrough study, an international team of scientists, including Professor Nikolai Brilliantov from the University of Leicester, has solved an age - old scientific riddle by discovering
that planetary rings, such as those orbiting Saturn, have a universally similar particle distribution.
Through theoretical modeling, Aurélien Crida of the University of Nice Sophia - Antipolis and Sébastien Charnoz of the University of Paris Diderot found that the moon - formation action begins at the edge of
a planetary ring, where a satellite can take shape without being shredded by the gravitational pull of the planet.
Computer simulations suggest that
planetary rings are not durable.
You reported research suggesting that Earth might once have had
a planetary ring, like Saturn (8 December 2012, p 18).
David Minton, assistant professor of Earth, atmospheric and planetary sciences, and Andrew Hesselbrock, a doctoral student in physics and astronomy, developed a model that suggests that debris that was pushed into space from an asteroid or other body slamming into Mars around 4.3 billion years ago and alternates between becoming
a planetary ring and clumping up to form a moon.
These systems are widely spread in nature in the form of aerosols and smoke on the Earth, or in the form of interstellar dust,
planetary rings and proto - planetary discs in space.
Planetary rings have long been associated with claims that planets evolved.
In addition, the engine supplies torque to
the planetary ring gear through the smaller electric generator; hence, some of the gas / engine power goes to the wheels.
Battery depleted, high - speed cruising:
The planetary ring gear is again released, shifting the drive motor to a higher gear ratio.