Today and tomorrow, asteroids the size of skyscrapers will whiz by the Earth.
Two enormous asteroids the size of buildings will fly past the Earth as you relax this weekend, according to NASA's Asteroid Watch.
Asteroids, also referred to as the asteroid belt, are objects made of rock, dust, and metallic minerals that predominantly reside in the space between the orbits of Mars and Jupiter. However, some asteroids deviate from this path and are outside Neptune's orbit, while others approach the Sun more closely. These asteroids are categorized as Near-Earth Objects because they occasionally approach Earth very closely while traveling through the Earth's orbit (NEOs).
An asteroid must be within 1.3 astronomical units (AU) of Earth to be classified as a NEO, or it must be at least 460 feet (140 m) away from the Sun to qualify as a potentially dangerous object (PHO)...