THESE asteroids are LETHAL, biggest is a whopping 939 km! Do they threaten Earth?

tech.hindustantimes.com:

NASA's observatory JPL keeps all of us informed about the potentially hazardous asteroids that are flying by close to Earth as well as their threat potential. The constant watch being kept on these monstrous space rocks is because there have been many asteroids that have crashed on Earth in the past. You must have heard about the infamous Chicxulub crater which was formed over 66 million years ago when a giant 10km wide asteroid in diameter struck the Earth and ended the era of dinosaurs. But you will be shocked to know that it wasn't the largest asteroid that scientists have found so far. There are some other behemoth asteroids that may pose a bigger threat to Earth! Let's take a look at the 5 largest asteroids found yet.

The largest asteroid known to date is Ceres, which is said to be around 939.4 km in diameter, which is as big as Alaska, the largest state in the USA, starlust.org mentioned. It rotates around the sun once every 1,678 Earth days.

The second largest asteroid is known to be Vesta, which measures around 525 km in size. Despite the fact it is smaller than Ceres, you may even see it with the naked eye because of its brightness. The spherical-shaped asteroid has separated into crust, mantle and core much like Earth.

Pallas - the third largest asteroid was first classified back in 1802, and it was first considered to be a planet. It measures around 513 km, according to Starlung.org. Its surface is covered with more craters than asteroid Ceres or asteroid Vesta.

Fourth largest and one of the most interesting facts about asteroid Hygiea is that, unlike other asteroids, it is very close to achieving hydrostatic equilibrium, which may make it a dwarf planet in the solar system. However, it measures around 444 km wide