A nucleus first forms of rocks and frozen gases. Solar radiation or solar wind acts on this nucleus to form a comet
comets are formed from ice and gases
Because they are formed of ice. Space is cold, so everything is frozen.
Comets and meteors were formed, along with the rest of the solar system, about four and a half billion years ago.
As of 2021, spacecraft have studied five comets up close: Halley's Comet (by the European Space Agency's Giotto spacecraft), Comet Borrelly (by NASA's Deep Space 1), Comet Wild 2 (by NASA's Stardust spacecraft), Comet Tempel 1 (by NASA's Deep Impact spacecraft), and Comet 67P/Churyumov-Gerasimenko (by the European Space Agency's Rosetta spacecraft).
Nobody let them in. They formed with the solar system.
comets are formed from ice and gases
Because they are formed of ice. Space is cold, so everything is frozen.
Comets move
No. Comets are not "on" anything. They are free objects in space.
Comets and meteors were formed, along with the rest of the solar system, about four and a half billion years ago.
Comets in space have an orbit path.
As of 2021, spacecraft have studied five comets up close: Halley's Comet (by the European Space Agency's Giotto spacecraft), Comet Borrelly (by NASA's Deep Space 1), Comet Wild 2 (by NASA's Stardust spacecraft), Comet Tempel 1 (by NASA's Deep Impact spacecraft), and Comet 67P/Churyumov-Gerasimenko (by the European Space Agency's Rosetta spacecraft).
The National Aeronautics and Space Administration's (NASA) "Deep Impact" mission to explore comets was launched on January 12, 2005. Refer to the NASA link, below, for further information.
in the oort cloud
Comets are composed of ice and dusty and are present in space. There are over 5 thousand different known comets.
comets are large balls of gas and ice that are flying round in space. :-)
Metoroids are formed when astoroids collide or comets break up.