Supernova are intense explosion which happens after giant star explodes!
but in this video you will know it is quite opposite.
...
https://www.youtube.com/watch?v=lmy6VNiVmBM
This video tells what is the size and threats about the asteroid in 2020.
click here to know about me: http://simonjp.pythonanywhere.com/
...
https://www.youtube.com/watch?v=Jwy6gxx9sYA
Have you ever imagine how moon would look if it get's replaced with other moons ?
Music: https://www.youtube.com/watch?v=Bkg08NvtvBU (Royalty free)
please check out my other channel : https://www.youtube.com/channel/UCnQ-Ao5JP4UuqeNwqt2ZisA
...
https://www.youtube.com/watch?v=ZIXGKE2A_wY