one of the numerous small, solid bodies that, when gathered together, form a planet.
Viktor Safronov
Planetesimal formation.
In order of size, smallest to largest, it could be a meteoriod, a defunct cometary nucleus, a comet, an asteroid, a planetesimal or a plutino.
The largest of Neptune's moons, 'Triton' is larger than the planetesimal, Pluto. The much, much smaller moon, Proteus, is next in size. Larissa is a little smaller than Proteus, and Galatea is a little smaller than Larissa.
The Earth is about 4.5 billion years old and has had an atmosphere since it formed, but about 3.8-4.1 billion years ago there was believed to be the Late Heavy Bombardment, where a planetesimal roughly the size of Mars hit the Earth, breaking off a large chunk that formed into the Moon. This impact would have obliterated the atmosphere, but it has reformed naturally since then. So, the answer to your question is approximately 4 billion years old.
anu ang teoryang planetesimal
Viktor Safronov
Planetesimal is the name some theorists give to the individual chunks of material (rocks or ice) that merge together over a period of time to form a planet.
Planetesimal ; see related link .
The period of "planetesimal formation".
Charon is a natural satellite of Pluto, but Pluto is a planetesimal, not a planet.
one of the numerous small, solid bodies that, when gathered together, form a planet.
Planetesimal: a small, irregularly shaped body formed irregular by colliding matter
NASA recently released a photo of the spreading debris from a collision in the asteroid belt.
Planetesimal formation.
Planetesimal hypothesis is the theory of the formation of the planets. It is believed that cosmic dust particles continuously stick together resulting in the formation of the planets.
Uranus orbits on its side. It probably does so because a planetesimal struck the planet near the poles, toppling it .