What energy does not add additional heat to the atmosphere

The Earth does not continue to get hotter and hotter as it absorbs energy from the sun, because it gives off energy to space as invisible infrared radiation. ... The increased amounts of greenhouse gases human activities are adding to the atmosphere have upset the balance

This phenomena is simply because the galaxies are VERY far away. Light though moving at a very high speed has a finite speed so it takes time for light to get to use. (8 second from the sun) because of this these galaxies are so far away that light they emitted all that time ago is reaching us now..