Archive for August, 2010
Origins – Back to the Beginning
Published August 31, 2010 Alex Michael Bonnici , Neil deGrasse Tyson , NOVA , Origin of the Universe , Origins , PBS , The Big Bang Theory Leave a CommentMission to an Asteroid
Published August 30, 2010 asteroids , Near-Earth object , Ralph Buttigieg , Space Exploration Leave a CommentIn the last decade, the search for hazardous asteroids which might impact Earth has yielded an unexpected benefit. Astronomers have discovered a few dozen very small asteroids whose orbits around the Sun are similar to Earth’s. Round trip missions to these asteroids are therefore much easier than to previously known Near Earth Asteroids, and roughly as easy as landing on the Moon. These asteroids represent a new potential destination for near-term human space exploration. Since favorable mission opportunities occur only a few times per decade, it probably would not be prudent to focus the human spaceflight program exclusively on asteroid exploration and develop new spacecraft customized for asteroid missions. Instead, asteroid exploration should be conducted in parallel with other missions such as Lagrange point visits or lunar landings, using common spacecraft designed for multiple types of missions. The authors have investigated the feasibility of conducting an asteroid mission that would complement NASA’s lunar exploration architecture, using the launch vehicles and Orion spacecraft which would be used for lunar exploration. The proposed mission concept, called Plymouth Rock, combines a pair of Orion spacecraft with only modest modifications to provide the necessary propulsion, living space, and life support capability for two astronauts. Human asteroid missions have many of the same functional requirements as lunar landings, so that complementary asteroid and lunar missions may be feasible even if the lunar exploration architecture changes from the current plan.
We have concluded that the dual-Orion configuration can probably support deep space mission durations of five to six months. Longer missions are constrained by radiation exposure, volumetric packaging limits for life support consumables, and the small habitable volume available. There are at least three opportunities between 2015 and 2030 when such a mission could be performed. These occur in 2019-2020, 2028, and 2029. All of the asteroids in question are small, between 5 m and 50 m in diameter. The number of opportunities is increasing as more asteroids are discovered. A dual-Orion configuration probably represents the minimum
capability necessary to perform an asteroid mission. Several additional mission opportunities to larger asteroids would be feasible for an upgraded spacecraft with a larger propulsion system. Desire for enhanced capabilities, such as a larger crew size and improved extravehicular activity (EVA) support may drive the need for a larger spacecraft. One of the two Orion spacecraft could be modified into an Orion Deep Space Vehicle with a larger habitat module suited for deep space operations rather than reentry.
By sending astronauts to explore these asteroids and bring back samples for study on Earth, we can learn about the formation and evolution of our solar system. We can improve our understanding of the threat to our planet from asteroid impacts, develop the practical knowledge needed to protect ourselves if necessary and even test this capability. We could also assess the feasibility of harnessing asteroid resources for a growing human civilization. If performed prior to the next lunar landing, a mission like Plymouth Rock can support lunar exploration plans by proving out the launch vehicles, spacecraft, and many of the operations for a lunar mission before the lunar lander is ready, much as the Apollo 8 mission did in 1968. A mission to an asteroid would also be valuable practice for a trip to Mars. Progressively more challenging asteroid missions provide an opportunity to incrementally develop expertise needed for long missions in deep space, without the leap in cost, complexity, duration, distance, and radiation exposure required for a Mars mission.
Of course theres a bit of a problem with all this, the Orion spacecraft does not exist and is no longer supported by the Obama administration.;
Note: Trent Waddington blogs regularly on asteroid missions and is worth following.
Origins – Where Are All the Aliens?
Published August 29, 2010 Alex Michael Bonnici , Astrobiology , Neil deGrasse Tyson , NOVA , Origins , PBS , SETI Leave a Comment
Origins – How Life Began
Published August 28, 2010 Alex Michael Bonnici , Bio-genesis , Neil deGrasse Tyson , NOVA , Origin of Life , Origins , PBS Leave a Comment
Here’s a new way to explore Aquatica. I want one!
More here.
Have a look at this video. It shows all the new asteroids discovered since 1980.
The final colour of an asteroids indicates how closely it comes to the inner solar system.
Earth Crossers are Red
Earth Approachers (Perihelion less than 1.3AU) are Yellow
All Others are Green
Notice now the pattern of discovery follows the Earth around its orbit, most discoveries are made in the region directly opposite the Sun. You’ll also notice some clusters of discoveries on the line between Earth and Jupiter, these are the result of surveys looking for Jovian moons. Similar clusters of discoveries can be tied to the other outer planets, but those are not visible in this video.
As the video moves into the mid 1990’s we see much higher discovery rates as automated sky scanning systems come online. Most of the surveys are imaging the sky directly opposite the sun and you’ll see a region of high discovery rates aligned in this manner.
At the beginning of 2010 a new discovery pattern becomes evident, with discovery zones in a line perpendicular to the Sun-Earth vector. These new observations are the result of the WISE (Widefield Infrared Survey Explorer) which is a space mission that’s tasked with imaging the entire sky in infrared wavelengths.
Currently we have observed over half a million minor planets, and the discovery rates snow no sign that we’re running out of undiscovered objects.
Orbital elements were taken from the ‘astorb.dat’ data created by Ted Bowell and associates at http://www.naic.edu/~nolan/astorb.html
NOVA: Welcome to Mars
Published August 27, 2010 Alex Michael Bonnici , Astrobiology , Mars , NOVA , PBS Leave a Comment
Image by MystifyMe Concert Photography™ via Flickr
The Amazing Peter Madsen
Published August 26, 2010 Copenhagen Suborbital , Peter Madsen , Ralph Buttigieg 2 CommentsRobert Truax’s Volksrocket |
I always knew it had to happen. Sooner or latter someone was going to build a home made rocket and try to ride it into space. Years ago Robert Truax tried it with the Volksrocket
but failed to find the 1 million dollars needed to complete the project. Now a Dane, Peter Madsen is having a go:
A group of engineers in Denmark are preparing to do just that – launch a home-built rocket, along with a human passenger, more than 100km into the sky.Dubbed HEAT1X, the rocket will be launched from a floating barge in the sea just outside the Danish border, 12 nautical miles from shore.And it will be towed out there by a submarine built by one of the men behind the rocket project.Eccentric engineering genius Peter Madsen lives onboard that homemade submarine, a project that gained him internet fame last year and a Discovery Channel documentary.Looking to go one up in 2010, Madsen founded Copenhagen Suborbitals with Kristian von Bengston with the aim of building the world’s largest amateur space rocket.Over the last year-and-a-half they have led a team of volunteers to create the HEAT1X rocket and the micro spacecraft it will launch, called Tycho Brahe-1.Tycho Brahe-1 will carry one human passenger, in a half-seated position, into space and back down again.The seat is designed to minimise the gravitational pull on the passenger’s spine.Whoever is on board will also have to wear a pressure suit, like those worn by fighter pilots, to make sure they don’t pass out.At the top of the module is a see-through polymer plexiglass dome, giving the astronaut a once-in-a-lifetime view of their journey.It’s planned that the spacecraft will travel in an arc, jettisoning the rocket about halfway up and eventually peaking more than 100km above the Earth before coming down.After it re-enters the atmosphere, parachutes will be deployed to slow it before it hits the water.
Heres a video of Mr Madsen and his subs and rockets (thanks Alex for the link)
NOVA Mars Dead or Alive
Published August 26, 2010 Alex Michael Bonnici , Astrobiology , Mars , NOVA , PBS , The Search for Life On Mars Leave a Comment