Cassini spacecraft has had its last close Titan flyby at 979 kilometers above the moon's surface. During this flyby, Titan's gravity bent its trajectory, so now, Cassini will begin a series of the last 22 dives between the rings and the planet. The encounter accelerated spacecraft - Cassini received increase of velocity approximately of 860 m/s with respect to Saturn.
The first dive will happen on April 26. The last - Sept.15, when Cassini will burn in the atmosphere.
Earl Maize, Cassini project manager at JPL:
With this flyby we're committed to the Grand Finale. The spacecraft is now on a ballistic path, so that even if we were to forgo future small course adjustments using thrusters, we would still enter Saturn's atmosphere on Sept. 15 no matter what.
Image: NASA/JPL Cassini between inner ring and Saturn's surface
Since 1961 the equation has been updated to take into
Technologies that have been proposed for use in starship propulsion include ion engines, solar sails, antimatter engines, fusion engines, and the theoretical Alcubierre drive, or warp drive. These self-contained vehicles would contain a full life support system for their crew, allowing long term habitation. They would need to act as fully closed ecosystems, utilizing near 100% recycling efficiency for water and air. Large scale food production would require the implementation of hydroponic farming, and
Giant clouds of gas and dust float around in space. These clouds of gas eventually collapse and create stars or are dispersed.
Active galactic nuclei, AGN for short, are black holes at the center of galaxies that are shooting out matter and energy. This happens when the black holes are feeding on gas clouds or stars. While AGN are eating gas they are often brighter than the rest of the galaxy they inhabit. Few gas clouds last beyond a million years.
Outshining the rest of the galaxy will have an effect on the rest of the galaxy. This energy heats up the gas clouds in the galaxy. Under normal conditions this would spre
For the spacecrafts, exploring outer Solar system use of solar energy becomes inefficient because of low sunlight, and all missions, going beyond Jupiter orbit must use another energy source.
The most commonly used source of heat and electricity in the far space is rare artificial element - Unobtanium Plutonium 238 (do not confuse with Plutonium 239, used in nuclear weapons).
Famous NASA missions Voyager-1 and 2, launched in 1975, were equipped with RTG (Radioisotope Thermal Generator) on Pu238 and are still working. At the launch, electric power was 470 Wt at 30 volts DC, and to the end of 2015 it still had 255 Wt power left. Both spacecrafts will stop functioning in 2025, and it will happen only because the fuel for auxilliary thruster will end and they will not able to position antenna to the Earth.
Cassini also obtains energy from RTGs, it has two on board:
There was a fascinating episode of the Guardian science podcast about a project to send probes to the nearest star using lasers to accelerate them to incredible speed. Conventional rockets could take thousands of years to get there. The Breakthrough Starshot Initiative wants to build tiny probes that weigh a few grams with a 'sail'. Massive lasers down on Earth would push on this to get it up to a fifth of light speed. So it would only take decades to get to Proxima Centauri, which may have a habitable planet.
There are lots of challenges that include:
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My spacecraft's triple thrusters propelled me toward my next planet. From my vantage point I could see this planet had an abundance of water. Archipelagos were strung across the sparkling water. I had high hopes that this planet would be teeming with life.
I landed my craft on one of the islands, and opened the hatch. Apart from the wind, there was complete silence. There were some signs of life; a few hardy plants clung bravely to the red rocks carved into twisted shapes by the eroding forces of the ceaseless wind, but the quiet was so total I felt little confidence in finding animal life in this area. I decided to move on.
I walked along the dusty, red surface until I reached some water. The whole way there, my journey was accompanied by no sound other than that of the wind blowing through the leaves of tho
Alrighty , let's see if I can finally get another post on here , after being under the weather for a while now (the sick kind not the intoxicated kind haha) and after playing lumberjack for a few days (man that is tough / tiring).
Anyway , finally had a clear night a few nights ago. A nice break from all the cloudy nights and days of not so good weather that seemed to be never ending.
First I set up everything as per usual , but this time i thought I would try to set up my mount using Drift Alignment , which i had never tried before. Usually I just use the polar scope and hope for the best. The method I tried was sort of a combination of the following pages :
It didn't really work out too well for me that night , so I must have done so
Exoplanets, orbiting red dwarfs, are the main newsmakers in astronomy today. The reason is simple: their planets are easy to find, as their orbiting periods are short - no more then month or two. The most proved method for exoplanet search is transit of the planet in front of the star - changes in brightness tell astronomers about planets presence. As the orbit period is short, less time needed, because to be sure that there is a planet, several passes needed. To find Earth from 10 light-years distance, with its year 365 days long, many years of observations needed.
Image: ESO/spaceengine.org (Artist's impression of Super Earth, obiting red dwarf)
The newly discovered super-Earth LHS 1140b orbits in the habitable zone around a faint red dwarf star named LHS 1140, in the constellation of Cetus (The Sea Monster)
Saturn's ring system on the new image from Cassini: on the top there is A-Ring and two gaps - Encke and Keeler, named after their discoverers. Bright arc below - F-Ring. And bright point between A and F rings, well, it's our Earth.
It is symbolic, that image was taken on April, 12 - the day, when 56 years ago first human went to Earth's orbit.
Earth is imaged from the distance 1,4 billion kilometers. It's not seen, but Earth is turned to us with South Atlantic. Zooming the image we can see another dim point - our Moon.
During its 13 years service, Cassini several times imaged Earth and other planets. This is Saturn's neig
For those who don't know what Humble Bundle is:
It started as a website where several PC games from indie developers were put together (Bundle), often themed, and where you (Humble) decided which price to pay for them.
Additionally 10% of the price is send to a charity.
The model has changed a bit. There are e-books now and a game shop and charities to choose.
Also the structure of the bundle has changed: Mostly there are 3 tiers now.
Tier 1 gets you a few
low key games. Minimum price is 1$.
Tier 2 is
Oldies but Goldies or games that weren't blockbusters. Minimum 8$
Tier 3 mostly consists of relatively new B-games. Often you get the basic version but not later DLCs.
2 days left for the Intergalactic Bundle!
I decided to write about this one since I like space games and I played a few of them, so here is the content of the bundle:
The S.S. John Glenn, Orbital ATK's seventh Cygnus cargo ship to deliver supplies and science for the crew on board the International Space Station, completed a four-day rendezvous to the orbiting laboratory on Saturday morning (April 21).
NASA's Cassini spacecraft will make its final close flyby of Saturn's moon Titan this Saturday. During this close flyby, Cassini will study seas of liquid hydrocarbons that spread across Titan's polar region, in best ever resolution. During the encounter, Cassini will pass 979 kilometers above Titan's surface at a speed of about 21 000 kilometers/hour.
The last, 127th ecounter is also a closest one. To set precise target, Cassini will use its thrusters to accurately aim. This manoeuver will also transfer Cassini to its final 22 orbits around Saturn before it burns in the giant's atmosphere on Sept., 15.
Cassini will study changes in Titan's seas and lakes system, and attempt for the first and last time to obtain data about the
The giant canyon on Saturn's battered moon Tethys snakes into darkness in a new photo by NASA's Cassini spacecraft.
Venus and Earth are almost twins in mass and sizes. But here similarites end. For many years scientists have been frustrated by their inability to understand Venus tectonics and why it is so different from Earth's.
A team of planetary scientists has created a physical model of part of the surface of Venus and in so doing may have solved the mystery of tectonics on Venus.
Image: NASA/JPL Venus map, composed by Magellan probe
The greatest mistery of Venus is that it totally lacks plate movement - one of the main Earth's features. (the large number of craters suggest that there is no churning). But giant trenches, looking like Earth's subduction zones (collisions between two of Earth's tectonic plates, where one plate sinks into the mantle underneath the other plate ) have been observed.
All of the factors that go into defining how a planet
The Hawk Fast Attack ship is a mid-size fighter armed with wing mounted disruptor cannons. Fast and agile it can cause serious damage to even larger capital ships once it gets within a fleets formation. As the mainstay fighter of the Heeter Navy it has earned a reputation as a tough and durable fighter over the 20 years it has been in service.