The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The cosmic Dark Ages, the period between the formation of the cosmic microwave background radiation and the formation of the first stars, is a critical stage in the evolution of our universe. During this period, the intergalactic medium consisted almost entirely of neutral Hydrogen, and consequently one of the only ways to study this epoch is through the highly redshifted 21-cm spectral line of Hydrogen...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.