In March gravitational waves were discovered from the early universe (moments after the big bang). This discovery is now in doubt. New analysis suggests that dust within our own galaxy is responsible for much if not all of the signal. While it doesn't completely rule out the presence of gravitational waves, it is a significant setback.
For more information see: http://www.scientificamerican.com/article/gravitational-wave-discovery-looks-doubtful-in-new-analysis/