(1) First of all, there is space itself. The average temperature of space is 2.73 Kelvin, or -454° fahrenheit. A human body subjected to such an extreme temperature would freeze instantly. However, even if you could remove the problem of temperature itself, the vaccum of space, along with the absence of breathable air, would kill you anyway.
(2) The nearest star to planet earth (the Sun) is a raging beast. Left to itself, it would eventually become a red giant before it collapsed into a white dwarf. In such a red giant phase, it would expand to such an extent so as to engulf the orbits of Mercury, Venus and the Earth. But even before this could ever happen, it would have increased in its energy output enough to destroy all life on Earth anyway.
(3) Then there is the constant threat of incoming asteroids. What most people do not know is that there is a branch of modern cosmology that is growing rapidly and is focused on tracking asteroids that may pose a risk to Earth. NASA itself is increasing its budget for the NEO program (Near Earth Orbit Program) in order to track possible risks. What has sparked interest in this subject recently are the several near misses have have occurred in the last three years, including a number of asteroids that were completely undetected because they approached the Earth from our astronomical blind spot - the sun. In fact, one astroid came so close that it passed between some of our orbiting satellites and the earth itself (2004 YD5).
My review of this film:
Romans 1:22-23: 22 Professing to be wise, they became fools, 23 and exchanged the glory of the incorruptible God for an image in the form of corruptible man and of birds and four-footed animals and crawling creatures.