MemberMarch 9, 2021 at 12:31 pm
Hi Deborah, I appreciate you putting this thread somewhere.
From this NASA website the likelihood of Billions of comets in reserve can be considered.
The overview is so short and government work is public domain in the US, so I’ll just paste it here. Though I’m afraid the format might get scrambled.
Comets are frozen leftovers from the formation of the solar system composed of dust, rock and ices. They range from a few miles to tens of miles wide, but as they orbit closer to the sun, they heat up and spew gases and dust into a glowing head that can be larger than a planet. This material forms a tail that stretches millions of miles.
Comets are cosmic snowballs of frozen gases, rock and dust that orbit the Sun. When frozen, they are the size of a small town. When a comet’s orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that stretches away from the Sun for millions of miles. There are likely billions of comets orbiting our Sun in the Kuiper Belt and even more distant Oort Cloud.
The current number of known comets is: