Let's name all the scientific inaccuracies in this movie
1. Space shuttles can turn and glide in space with ease despite having no air to maneuver in.
2. A Texas sized asteroid's gravity doesn't cause tsunamis to form or volcanoes to erupt on Earth.
3. A Texas sized asteroid is unable to be seen by the naked eye despite it's colossal size and luminosity.
4. Drilling 800 feet and dropping a nuclear device will somehow split the asteroid in two.
5. The asteroid (planetoid) has canyons and razor sharp rocks despite being large enough to pull its mass in to be spherical.
Continue.