Wormholes are one of the stranger objects that arise in general relativity. Although no experimental evidence for wormholes exists, scientists predict that they would appear to serve as shortcuts between one point of spacetime and another. Continue reading
The Milky Way has an estimated 160 orbiting globular clusters -hundreds of thousands, and sometimes millions of stars all bound together in a tight ball due to their gravity- of which one quarter are thought to be ‘alien’ invaders from other galaxies, according to research from Swinburne University of Technology (Australia). Continue reading
Lonely Earth-like planets with tumultuous cores could conceivably support life even if they had no stars, a new study says. Researchers Dorian Abbot and Eric Switzer at the University of Chicago have dubbed these theoretical worlds “Steppenwolf planets,” because… Continue reading
A launch loop (also known as a Lofstrom loop) is a proposed design for a very efficient non-rocket spacelaunch method. It is a much simpler concept than the space elevator, but still more complex than tether propulsion systems such as the rotovator. Continue reading
Astronomers have identified some 54 new planets where conditions may be suitable for life. Five of the candidates are Earth-sized. The announcement from the Kepler space telescope team brings the total number of exoplanet candidates they have identified to more than 1,200. Continue reading
This is the fourth and final part of the tether propulsion article of the non-rocket spacelaunch methods article series. This post will focus on references to the tether propulsion concept in fiction. The most prominent science fiction novels on the … Continue reading
The red supergiant star Betelgeuse is getting ready to go supernova, and when it does Earth will have a front-row seat. The explosion will be so bright that Earth will briefly seem to have two suns in the sky. The star is located in the Orion constellation, about 640 light-years away from Earth. Continue reading
The use of tethers in space poses many challenges and safety issues. This third part to the tether propulsion article will focus on those issues. A lot of the challenges and safety issues of a space tether system are similar to those of a space elevator described in a previous article, but some are unique to the space tether concept. Continue reading
This is the second part to the article about tether propulsion. It will focus on space missions that tested tethers in space. Gemini 11 mission: 1966 Gemini 11 mission with tether visible. Image credit: NASA. The first such mission took … Continue reading
Antimatter seems impossibly exotic, something that exists only in particle accelerators or in cosmic events many light-years away. But the next time there’s a big thunderstorm, look up at the sky: you’re looking at the creation of natural antimatter bursts. Continue reading