If the orbit of the Moon was level with the orbit of the Earth around the Sun, there would be a solar eclipse at every new moon, and a lunar eclipse at every full moon.
Sun/Moon/Earth = Solar eclipse Sun/Earth/Moon = Lunar eclipse
Yes, every closed orbit is an ellipse. Circles are "perfect" ellipses, but no natural orbit could be perfectly circular.
It can only occur at new moon, when the Moon is between Earth and the Sun. If it happens to perfectly line up in front of the Sun, the Sun's light will be blocked and we get an eclipse.
If the moon's orbital plane coincided with the earth's orbital plane, there would still bea maximum of one lunar eclipse and one solar eclipse in each lunar cycle.The difference would be that they would occur in everylunar cycle. We would have a totaleclipse every two weeks, with lunar and solar alternating.And that would just be the natural order of things. We wouldn't think any more about itthan we marvel today at the rising and setting of the sun.
An eliptical orbit. In theory a planet could also have a circular orbit, but no planet that we know of has a perfectly circular orbit, although some have a nearly circular orbit.
They are orbits and they are elliptical in shape. So the answer could be "orbits" or it could be "ellipses".
Apprently so if one could find perfectly preseved DNA
Maybe. no one knows. They have been like they are for thousands of years. But maybe in the future they could for whatever reason.
The Earth and Moon are rocks, moving in defined orbits. We can calculate when eclipses are going to happen, and this doesn't take a whole lot of skill to do; the builders of Stonehenge, 3000 years ago, could do it too.
Sputnik 1 made about 15 orbits per day
The moons of the big planets can go into eclipse when they are in the shadow of their planet.
Comets do indeed have orbits. Sometimes the orbits take thousands of years. For the most part, they stay in these orbits unless affected by the gravity of another body.