October 2023
The impact of weather on Ka-band frequencies
... using lower frequencies. The principal benefit of HTS is frequency re-use through the use of spot beams. With a conventional satellite, a global beam is spread out over a wide area, possibly covering a whole continent, but this means that...
March 2017
Planetary nebulae may hold clue in search of helium-3
... nebulae. The double-peaked profile could arise because the telescope beam does not cover the whole planetary nebulae, meaning that the beam size of the telescope is smaller than the size of the planetary nebulae...
December 2014
Asteroid Redirect Mission: preparing for Mars in deep space
... and Planning Team for Extraterrestrial Materials (CAPTEM) Task Force findings, January 2014. 6 Bombardelli, C., et al., “The ion beam shepherd: A new concept for asteroid deflection”, Acta Astronautica, Vol. 90, Issue 1, September 2013, pp 98–102...
March 2015
Dawn of ion propulsion
... as propellant. Inside the ion thruster, an electron beam, somewhat like the beam that illuminated the screen in televisions prior to a ...few years ago, bombards the xenon atoms. When this beam knocks an electron out of an atom, the result is an...
March 2016
Gravitational waves provide new window on the universe
... consist of two, 4 km long arms that are at right angles to one another. To test for gravitational waves, a laser is beamed through the cavity and is reflected on a suspended mirror, called a test mass, when it reaches the end of the...
August 2016
Our changing world and the mounting risk of a calamitous solar storm
...threat. There are many programmes that range from directed energy beam systems to ‘Laser Bees’ to nuclear energy systems that ..., we could also design-in solar power satellites that could beam back clean energy to Earth that could assist with the ...
