How do comets keep coming back?

To answer the last portion of your question, comets such as Halley, Hale-Bop, and Hyakutake pass by Earth on a predictable basis much in the same way as the planets in our solar system do; They are gravitationally bound to the sun despite their eccentric elliptical orbits.

What comets pass Earth regularly?

Halley’s Comet or Comet Halley, officially designated 1P/Halley, is a short-period comet visible from Earth every 75–76 years. Halley is the only known short-period comet that is regularly visible to the naked eye from Earth, and thus the only naked-eye comet that can appear twice in a human lifetime.

How do comets come towards the Earth?

Comets are believed to have two sources. The Belt contains many icy bodies which can become comets. Occasionally the orbit of a Kuiper Belt object will be disturbed by gravitational interactions with the giant planets in such a way as to cause the object to take up an orbit that crosses into the inner solar system.

How often do comets come?

This means that, on average, a major comet arrives every five to 10 years. Sometimes the visitations are clustered. A prime example is the years 1910 and 1911, when four major comets crossed the sky. The data also reveal that great comets arrive on average every 20 years.

How are comets made?

Comets are basically dusty snowballs which orbit the Sun. They are made of ices, such as water, carbon dioxide, ammonia and methane, mixed with dust. The gas tail is created by the solar wind, pushing gas away from the comet’s coma and pointing straight back from the Sun.

Where are comets born?

Short-period comets originate in the Kuiper belt or its associated scattered disc, which lie beyond the orbit of Neptune. Long-period comets are thought to originate in the Oort cloud, a spherical cloud of icy bodies extending from outside the Kuiper belt to halfway to the nearest star.