Is there a comet coming to Earth?

The comet is designated C/2017 K2 (PanSTARRS). It was between the orbits of Saturn and Uranus when they first saw it, but will finally make its way into the inner solar system this year. It'll be closest to Earth on.

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Subsequently, what happens if the moon hits the earth?

And another question, has an asteroid hit the sun? No asteroids have ever been observed to hit the Sun, but that doesn't mean that they don't! It is actually difficult for something that is orbiting to fall all the way into the Sun. This is because of a property of orbiting objects called angular momentum.

Subsequently, could an asteroid hit the sun?

Nothing will happen. The mass and the heat of the Sun are of such magnitude that even the biggest object in the solar system, Jupiter, hitting the Sun would cause just a momentary hiccup, and comets are actually tiny objects in the scale of the solar system. How can we stop an asteroid? An object with a high mass close to the Earth could be sent out into a collision course with the asteroid, knocking it off course. When the asteroid is still far from the Earth, a means of deflecting the asteroid is to directly alter its momentum by colliding a spacecraft with the asteroid.

Also, what are signs of good luck?

What do you consider lucky? While Ireland and its shamrocks remain synonymous with good fortune, the idea of a particular object bestowing positive karma upon its owner isn't unique to the country. Rabbit's foot. Carp scales. Scarabs. Acorns. Swastikas. "Evil eye" beads. The color red. How big is a falling star? The particles that enter our atmosphere during a meteor shower or when you see a shooting star are usually very small. Some are no larger than a grain of sand.