Space news #18: Is interstellar travel within our reach?
There has been talk over the past few months about a controversial propulsion system known as the EM drive. The device is a sealed cone shaped chamber with a microwave reflector at the narrow end. Emitting microwaves into the chamber produces a tiny, but measurable amount of thrust.
The problem with this idea? Conservation of momentum. Known space propulsion systems require something for the vehicle to push again, often fuel that is released at high velocity. Because of the vast distances involved, spacecraft usually have to carry a lot of fuel to get anywhere quickly. The only input the EM drive needs is electricity, it doesn’t have any moving parts and it doesn’t need any reaction mass.
While EM drive is a groundbreaking idea, it is far from proven. A number of labs have been able to replicate the original experiment and NASA is currently funding a small EM Drive project. It is difficult to find funding for ideas that contradict known physics. There are lots of theories but nobody currently has any proven idea of why it appears to work.
There’s still a long way to go. Many experiments will be needed to rule out every other conventional reason for the thrust before the only explanation is that it actually does work.
What does it all mean?
If the device could be scaled up to produce enough thrust to resist Earth’s gravity then it opens up the possibility of air travel in a vehicle without wings. Dare I say it, flying cars? Launching space vehicles from the ground would become simple and cheap. Rockets would be obsolete, for leaving the Earth at least.
Because the drive accelerates constantly, space travel will be much faster in and beyond our solar system. A vehicle could accelerate to the half point, turn around and decelerate the rest of the way. Journeys within out solar system would be measured in days or weeks. A probe could reach to the nearest star in less time than it has taken the New Horizons probe just to reach Pluto.
Where are all the aliens?
My biggest reservation, besides bending/breaking the known laws of physics, is where are all the aliens? Some have estimated that it would take just 50 million years to colonise the entire galaxy at sub-light speeds using conventional technologies that we understand. If aliens with a head start on us had a simple and cheap propulsion system like the EM drive, then why isn’t the radio spectrum full of alien chatter?
I don’t know where the aliens are, but if the EM drive is eventually proven to work then we’d better get out there and stake our claim on some of the Galaxy’s prime real estate before our neighbours move in.
Spaceflight
- Japan to land first unmanned spacecraft on moon in 2018
- SpaceX says rocket recovery failure due to throttle valve problem
- A blueprint for clearing the skies of space debris
- Russian Mission Control Adjusts ISS Orbit to Avoid Space Junk
- NASA 3-D Prints First Full-Scale Copper Rocket Engine Part
- Xinhua Insight: How China joins space club?
- SpaceX’s Dragon Crew Capsule to Undergo Key Safety Test
- What Is a Geosynchronous Orbit?
- Mysterious X-37B Military Space Plane to Fly Again Next Month
- Ariane 5s first launch of 2015
- SpaceX Picks Up Launch Pace
- China’s satellite navigation system to expand coverage globally by 2020
- India Role Model in Space Science Benefiting Common Man
- Space Station over Lunar Terminator
- Showdown Over NASA Earth Science Budget Looms
- Dueling ‘Vulcan’ Space Projects Prompt Rocket Name Quandary
- Commercial Lunar Transportation Services: a speculation
- On the Verge Enabling Dreams of Interstellar Travel?
- A Revealing Look at the Once Secret Spysat Lacrosse 5
- Russian Spacecraft Spinning Out of Control
- MESSENGER Is Dead, Long Live Its Mercury Imagery
- X-37B Goes Fourth
- Amazing Photos of Mercury By a Doomed NASA Spacecraft
The Solar System
- Scientists Identify Missing Wave near Jupiter’s Equator
- Millimetre-sized stones formed our planet
- Where Did Earths Water Come From? | Video
- Mars Life Search: Iron-Rich Rocks Could Be Key
- Could Curiosity’s Wheel Damage Be Caused by Corrosion?
- Unmasking the Secrets of Mercury
- Saturn’s Faint D Ring
- Rover on the Lookout for Dust Devils
- Dawn Spacecraft Enters Science Orbit Around Ceres
- Saturns sponge-like moon
- Tracking Japans asteroid impact mission
Exoplanets
- Astronomers probe inner region of young star and its planets
- Life on Tau Ceti?
- Alien Light
- First exoplanet visible light spectrum
- Habitable Worlds Around Tau Ceti?
- Exoplanet Spectrum in Visible Light
- To Find Alien Earths, Scientists Comb Kepler Data
- Planet Ripped Apart By White Dwarf?
- Chemistry of seabed’s hot vents could explain emergence of life
- Astronomers join forces to speed discovery of habitable worlds
- Are Earth-Like Planets Common Or Rare?
- Three Super-Earths Orbit HD 7924
- HD 7924: Planets with a Robotic Assist
The Universe
- Spy Agency’s Telescopes for Dark-Energy Mission?
- Future Space Observatories Will Carry Hubble’s Legacy Forward
- The Whole Universe Is MUCH Bigger
- Clusters of Monster Stars Lit up the Early Universe
- Astronomers Find Runaway Galaxies
- There Might Be Civilizations Existing Beyond Galaxies
- Planetary Nebula Mz3: The Ant Nebula
- Search for Extraterrestial Life: Russian Space Program
- Virtual Telescope Expands to See Black Holes
- ASU team searching for signs of life in the stars
- Citizen Scientists Discover Five New Supernovas
- Eleven Elliptical Galaxies Found Flying Free
- How Astronomy Diminishes, Yet Inflates, Us
- Strange supernova is missing link
- Astronomers find runaway galaxies
- Graveyard of Stars May Surround Milky Way’s Black Hole
- Water could have been abundant in the first billion years
Everything else