Comets
None. Comets have a tail, but that's not "usually", only when they are close to the Sun (which is when we see them, of course). Most of the time, when they are far away from the Sun, they have no tail. The tail is caused by the solar wind.
Short period comets are thought to originate in the Kuiper Belt, outside the orbit of Neptune.Long period comets originate in the Oort Cloud, which is far more distant, about half way to the nearest star!Comets, as with any astronomical body, can have its orbit perturbed (changed) by external gravitational forces. Long period comets can become short period and vice versa. The orbits can range from a few tens of years to many thousands, some can even escape altogether.
Houston Comets ended in 2008.
Houston Comets was created in 1997.
Comets spend the majority of their time in the far reaches of our solar system, where they are not easily visible from Earth. They only become visible when they enter the inner solar system and are illuminated by the Sun, hence their rare appearances. Additionally, many comets have long orbital periods, further contributing to their infrequent sightings.
they tend to move past in routines orbiting our solar system or our galaxy in about 70 years
Yes, because comets are so tiny and dim.
That will depend on when you make the trip. There are MANY comets detected each year, although only a few become bright enough to be seen with the naked eye, and very few are bright enough to be seen with the naked eye from bright city lights. We typically detect comets when they are about a year out from the Sun, although a flurry of smaller "Sun-diving" comets were detected only hours before they fell into the Sun in December, 2010.
Yes,when they are close enough to Earth and it is clear out.
TELESCOPE
no only comets.
More do then we think, but many we aren't able to see. Ones like Haley Bop you could see with a good telescope.
See related link for a list of periodic and non periodic comets.
when your balls drop
Because there aren't always comets!
No. Comets are usually a few thousand feet to a few miles wide. An object smaller than a sand grain would not be visible in space.Meteors which enter the earth's atmosphere are often sand grain sized, but the once we can see are usually from pebble sized objects.