... Degas Ray Crater on Mercury . ... 16.12.2000 . ... Credit: Mariner 10 Project , NASA Explanation: Like the Earth's Moon, Mercury is scarred with craters testifying to an intense bombardment during the early history of the Solar System. ... Craters older than Degas are covered by the ray material while younger craters are seen superimposed on the rays. ... December 2000 . ... Publications with keywords: crater - Mercury - Mariner 10 . Publications with words: crater - Mercury - Mariner 10 . ...

... 2000 December 16 . Degas Ray Crater on Mercury . Credit: Mariner 10 Project , NASA . ... In the above mosaic the bright rays emanating from the 45 kilometer wide Degas crater almost appear to be painted on . ... Craters older than Degas are covered by the ray material while younger craters are seen superimposed on the rays. Mercury's gravity and density are about twice that of Earth's Moon so such bright ray craters on the lunar surface tend to be much larger. ... About APOD | ...

... December 8, 1996 . Degas Ray Crater on Mercury . ... Explanation : Like the Earth's Moon, Mercury is scarred with craters, testifying to an intense bombardment during the early history of the Solar System. ... In the above mosaic the bright rays emanating from the 27 mile wide Degas crater almost appear to be painted on . The rays consist of light colored material blasted out during the crater's formation. Numerous smaller, younger craters are seen superposed on the Degas crater itself. ...

... Mercury Image and Animation Index . ... Craters dot the surface. ... Until Mariner 10 , little was known about Mercury because of the difficulty in observing it from Earth telescopes. ... The craters range in size from 100 meters (the smallest resolvable feature on Mariner 10 images) to 1,300 kilometers. ... The largest crater on Mercury is the Caloris basin . ... Others consider any crater larger than 200 kilometers a basin. ... The majority of Mercury's surface is covered by plains. ...

... The Sun gives us light and heat, sustaining life on Earth. ... This uneven rotation, coupled with the churning of the upper layers, might well be what produces (by a "dynamo mechanism", described in a later section) regions of intense magnetic field, seen by observers on Earth as dark sunspots. ... Near sunspots those streamers seem to be shaped by the Sun's magnetic field lines, and above the Sun's poles they suggest field lines rising from twin magnetic poles like those of the Earth. ...

... In summer 1994, the biggest news in astronomy was the collision of comet Shoemaker-Levy 9 with Jupiter. During this school year, Jupiter will charge back into the limelight with the arrival of the Galileo spacecraft (see figure 8 ). On Dec. 7, following a tortuous six-year ramble through the solar system, Galileo will begin its two-year mission studying Jupiter and its gaggle of moons. ... Besides the camera, Galileo will carry instruments capable of identifying minerals on Jupiter's moons. ...

. The figure shows an image of Mercury's surface (left: obtained using publicly available mosaic of Mercury from the MESSENGER spacecraft and a color-coded view of the global crater areal density (right), obtained by measuring craters greater than 15 miles (25 kilometers). The region within the white line corresponds to the heavily cratered terrains analyzed to calculate the age of the oldest surfaces on Mercury. // Johns Hopkins APL

... Alien Life . ... During a mission planned to last a Martian year (nearly two of our years) after landing , Curiosity will use its instruments to investigate whether this area of Mars has ever enjoyed conditions suitable for life , especially the presence of liquid water.Lower layers of Aeolis Mons could reveal there was once a lake within Gale Crater long ago.But this is just the beginning of what ... Methane Not Detected by Curiosity Rover Does Not Rule Out Life on Mars . ... Astronotes...

GRANAT is the Russian x-ray sattelite launched to the high apogee orbit (200,000 km) and operated almost for 10 years (1989 -1999) , carrying out four major instruments: French SIGMA coded-mask hard x-ray telescope (30-1000 keV), Soviet ART-P coded-mask telescope (2??-60?? keV), all-sky monitor WATCH (6-150 keV), and a gamma-burst detector PHEBUS . ... Since September 1994, GRANAT is in the survey mode. ... Explore pages devoted to individual GRANAT instruments (including main scientific results): . ...

... First briefly outline two important models for pulsar electrodynamics: Vacuum and Magnetospheric models. Two models, two electric fields: inductive and potential. Screening of the induced E and produced co-rotation E by the screening current density. ... These are not the screening current density we needed. ... Force-free condition: Co-rotation E: GJ charge density: Two Electric Fields EI from the Vacuum model is inductive in nature, E from the magnetospheric model is potential and inductive. ...

... NASA SPACECRAFT FINDS NEW EVIDENCE FOR WATER ICE ON MERCURY . ... The new data indicate the water ice in Mercury's polar regions, if spread over an area the size of Washington, D.C., would be more than 2 miles thick," said David Lawrence, a MESSENGER participating scientist at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Md., and lead author of one of three papers describing the findings. ... Water ice concentrations are derived from the hydrogen measurements. ...

... We computed the permanently shadowed areas and temperatures inside the craters for the variation of the position of the lunar pole of rotation with respect to the ecliptic pole with a period of 18.6 years. ... According to our results, the total permanently shadowed area in the polar craters of the Moon is equal to 50428.7 km2, or 0.13% of the total area of the lunar surface [3]. ... The area of permanently shaded part of a crater makes 59 % from all area of a crater [3]. ...

... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Site Info . ... It is from from Voyager 1 and shows a whopping big impact crater dominating the profile of the moon. Note that Mimas is about 400 kilometers across (about 250 miles). ... The wall around the crater is 5 kilometers high, and that central peak rises 6 kilometers above the surface (many impact craters have a large central peak which is caused by a pressure rebound from the impact). ... 2008 Phil Plait. ...

... This task fixes a number of distinct problems in ODF time correlation data: . Due to wrong ground station and spacecraft time propagation delays hardcoded in XSCS v71 all time correlation files produced with these XSCS versions contains too small UTC values. ... During several periods in 2002 timing data from the Kourou ground station showed various anomalies which manifests themselves as discontinuities at the time of a handover to/from this station. tcsfix does: . ... if (rev < 207) . ...

Giant Jupiter. Jupiter . ... Jupiter has no solid surface that is why speaking about its dimensious point the radius of the upper border line of the clouds, where the presseru is about 10 KPa; radius of Jupiter on the equator is 71400 km. ... The Jupiter satellites. ... Nowadays 16 satellites of the Jupiter are known: Adrastea, Mitis, Amaltea , Phina,then 4 Galilei satellites: Io , Europe , Hanimed , Callisto , Leda, Aimalia, Zicitea, Elara, Ananke, Carme, Pasipe and Sinope. ... Jupiter's ring. ...

Next: This Work Previous: Rotation Periods of ZAMS Stars . ... There are currently several groups involved in the studies of the rotation periods of PMS stars. ... Overall, there are about 100 rotation periods known for PMS stars. ... Furthermore, the stars with periods near 8 days also tend to have infrared excesses which can be interpreted as arising from disks. ... In the first interpretation, the gap occurs because locking mechanism holds stars at a eight day rotation period. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Magnetic (red squares) and non-magnetic (black points) Herbig Ae/Be stars plotted in a Hertzsprung-Russell diagram. ... Using the projected rotational velocities measured at the surface of the stars, we have calculated the angular momentum of the sample and plotted it as a function of age. We have then compared the angular momentum and the v sin i distributions of the magnetic to the non-magnetic HAeBe stars. ...

... For the first time during space experiments it was shown an opportunity of ballistic transformation of a wave through an ionospheric wave barrier. ... New nonlinear electromagnetic structures like collisionless shock waves ( "jumps" of electric and magnetic fields, plasma density "jumps") are found. ... It has been shown, that the modulated beam of electrons can be used for nonlocal determination of electron density and the magnetic field value. ...

show_spacecraft_parameters (version 02/04/16) . ... o update for DB49 that removes some fields app 01/20/14 . o add DSN fields app 08/07/14 . o updated for current fields & python 3 jef 02/04/2016 . Modules . ... get_params (db, db_version, prd, override, verbose) . get_scenario_data (db, scenario) . ... scenario=<scenario>] . ... Cannot be specified if a prd . ... Cannot be specified if a scenario . ... absolute_import = _Feature((2, 5, 0, 'alpha', 1), (3, 0, 0, 'alpha', 0), 16384) . ...

... Research objects and scientific purposes . Space scientific program includes development and launch of two supersmall spacecrafts "Universitetskiy" and "Kompas-2" intended for monitoring of radiation conditions near the Earth. ... All the studies conducted in the near-Earth space are characterised by strong radiation fields. ... The circular polar orbits, which cover all the near-Earth space, are the most favorable for comprehensive studies of the radiation conditions near the Earth. ...