Google has some experimental views for exploring search results. One of them is called time line view:
"The graph across the top of the page summarizes how dates in your results are spread through time, with higher bars representing a larger number of unique dates. Click anywhere on the graph to zoom in to that particular period of time, and use the text box to the right to specify any range of years, months, or days. Much as in map view, the results below the graph emphasize the dates contained on each page."
See how it works by looking at the results for this search on "space exploration". Type "space exploration view:timeline" into the search bar. The results below the graph are listed by date, below the information source.
What an interesting way to see information about a subject which includes an element of time.