Do all planets have moons?

Being new to astromomy, I was wondering, do all planets have moons? What are they? how did they get there?

No.
Mercury and venus don't have moons.
Mars has two very small moons - Phobos and deimos
Jupiter has (at last count) well over 50
4 of which can be seen in binoculars (Gannymede, Callisto, Europa, Io)
Saturn's biggest is Titan, but aslo has MANY more
Neptune and Uranus also have several.
The moon-count of the planets from Jupiter outwards is constantly rising, as new ones are constantly being discovered.
As for how they got there - some formed along with the parent planet, out of coagulating matter - as they got bigger, they attracted the smaller fragments around them -'sweeping' their orbit clean.
Others are 'captured' asteroids and comets which wandered too close, and got caught up in the planets' gravitational fields.
In general - the bigger ones formed alongside the planets, and the 'captured' ones tend to be among the smaller ones.
For up-to date info on amounts of moons, and names, try putting the planets' names into 'wikipedia', each planet entry has a section on it's moons.

how do the scientist know when a planet have or don't have moons how do they know how big the moons are.

Ghost wrote:

Being new to astromomy, I was wondering, do all planets have moons? What are they? how did they get there?

No, some don't have any moons. The moons are bits that fell off when the planet was forming.

what planets have moons and why dont you tellus

zoompad wrote:

<quoted text>
No, some don't have any moons. The moons are bits that fell off when the planet was forming.

Not always, Jupiter is a gas giant. Moons could be small planets caught in gravity. Our moon might have came from earth, but most other planets are not solid rock. Pluto I don't think is even a planet anymore.

My take on this...

Moons come in three flavours - large moons of gas giant planets, such as Io and Europa orbiting Jupiter, and Titan orbiting Saturn, formed at the same time as those planets, in a process similar to the fromation of the planets themselves.

Smaller moons, like Phobos and Deimos around Mars, are asteroids captured by the planet's gravity,and may be comparatively short - lived (on a scale of millions of years), eventually getting too close to the planet and breaking up to form ring systems, as around Saturn.

Earth's moon -almost a double planet - is thought to have formed early in the Solar System's history (about four billion years ago). A mars-sized planet (some astronomers call it 'Theia') collided with the Earth, partly merging with it, and throwing up a mass of debris into orbit, which coalesced to form the moon. This explains some of the Moons oddities - little or no nickel-iron core, the similarity of lunar rocks to terrestrial basalt, and the Moon's almost circular orbit - which is slowly drawing away from the Earth.

Will moon be change in dust particals as already satrun moon changed in dust which has made ring around the planet.?

the solar system is so cool

Zaheer Khan wrote:

Will moon be change in dust particals as already satrun moon changed in dust which has made ring around the planet.?

u never kno they could

what do terrestrial planets & gas giants have in common

pofirl;gb hyu8]]g n

quazemoto wrote:

what do terrestrial planets & gas giants have in common

thay r all in the same solar system

Do all gas planets have rings?????????

which planets have moons, if so how many

how many moons do the planets have

no
there you go

no

Sharon Cruz wrote:

how do the scientist know when a planet have or don't have moons how do they know how big the moons are.

hmm.. cause u were born! LOL!

omg this sucks! what a bunch of nerds