Astronomy picture of the day https://apod.nasa.gov/apod/archivepix.html
Universe today https://www.universetoday.com
Space.com https://www.space.com
Astronomy now https://astronomynow.com
All about space / space answers https://www.spaceanswers.com
BBC Science http://www.bbc.co.uk/news/science_and_environment
Guardian Space https://www.theguardian.com/science/space
Guardian Astronomy https://www.theguardian.com/science/astronomy
Jet Propulsion Laboratory (JPL) (See 'what’s up each month') https://www.jpl.nasa.gov
NASA https://www.nasa.gov
European Space Agency (ESA) http://www.esa.int/ESA
Surrey Satellite Technology (SSTL) https://www.sstl.co.uk
China http://www.cnsa.gov.cn/n6443408/index.html
India https://www.isro.gov.in
Japan http://global.jaxa.jp
SpaceX http://www.spacex.com
Blue Origin https://www.blueorigin.com
Virgin Galactic https://www.virgingalactic.com