Second Interview with an Astronomy Author
Recent editions of Astronomy Today's Sky Guide have been updated with the use of Mr. Guy Ottewell's 2007 Astronomical Calendar.
Second
A second (symbol s) is the base unit of time in the International System of Units (SI Units).
In 1967 it was defined as the duration of 9,192,631,770 'oscillations' of a caesium 133 atom (133Cs).
Second superstring revolution
The second superstring revolution was the intense wave of breakthroughs in string theory that took place approximately between 1994 and 1997.
Second smallest exoplanet found by Keck
DR EMILY BALDWIN
ASTRONOMY NOW
Posted: 08 January 2010 ...
Second phase: The British offensive of January to September 1900
The British Government took these defeats badly and with the sieges still continuing was compelled to send two more divisions plus large numbers of colonial volunteers.
Second
A unit of time equal to 1/60 of a or 1/3600 of an . The international definition was originally 1/86400th of a mean solar day in 1900, but is now instead the time required for 9,192,631,770 vibrations of a Cs atom.
Secondary Atmosphere :
The atmosphere that developed after primordial gases had been lost or had failed to accumulate is termed secondary.
Definition: second; s: The fundamental SI unit of time, defined as the period of time equal to the duration of 9,192,631, ...
Secondly, the different parts of the chimney are not independent. If they were independent (each on its own long thin rod connecting it to the center of rotation, if you can imagine it), each would accelerate at this point by (g sinA).
second (of angle): see arc-second.
second (of time): the fundamental unit of time.
Second Year
Our team was composed of a NASA scientist (Paul), sixth grade teachers in Glenarden, Maryland, two fifth grade teachers in Amherst, ...
Second Shuttle drawing
Draw a Space Shuttle by connecting points in all four quadrants of the coordinate plane.
Secondary mirror cage
Also in March, I got Baltic Birch plywood through a local cabinet maker. Router was used to cut rings which were then assembled with sections of 1.25 inch tubing and focuser board to form the structure shown below.
Second-Law definition of temperature
In the previous section temperature was defined in terms of the Zeroth Law of thermodynamics. It is also possible to define temperature in terms of the second law of thermodynamics, which deals with entropy.
Second creation story in Genesis: Gen 2: "7then the Lord God formed man from the dust of the ground, and breathed into his nostrils the breath of life; and the man became a living being." ...
secondary atmosphere The chemicals that composed Earth's atmosphere after the planet's formation, once volcanic activity outgassed chemicals from the interior.
secondary mirror
a relatively small mirror used in a telescope to redirect the light gathered by the primary mirror
seeing ...
Secondary Electron Conduction [LLM96]
SFR
Star Formation Rate
SFH ...
Second Asteroid Ida
Ida is 56 kilometres long. Like Gaspra, it is believed to represent the majority of main-belt asteroids in composition, though there are believed to be differences between the two.
second contact -- the beginning of the total phase of a solar eclipse marked by the leading edge of the Moon first completely obscuring the Sun.
SECOND GENERATION STAR
Second generation stars do not just burn hydrogen, they also burn heavier elements, like helium and metals, and were formed from supernova explosions (the debris of exploded population II stars).
Second of arc An angular measure. Each degree contains 3600 seconds of arc, and each minute of arc contains 60 seconds.
Second Method
One segment is fixed, and the measures are made as in the first method, excepting that the eye-piece is placed symmetrically with respect to the images under measurement.
Second
A unit of time defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom.
Secondary Abbreviation for secondary mirror. Small mirror that directs the light from the primary mirror to the eyepiece.
Semi-major Axis Half the distance across an ellipse measured along a line through its foci.
Second -- the SI base unit of time. See this extensive definition.
SEDR -- Supplementary Experiment Data Record.
SEF -- Spacecraft event file.
Second of Arc
See Minute of Arc. 60 seconds of arc make up one minute.
Secondary Atmosphere ...
second; s
The fundamental SI unit of time, defined as the period of time equal to the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom.
Secondary characteristics
Several planets or dwarf planets in the Solar System (such as Neptune and Pluto) have orbital periods that are in resonance with each other or with smaller bodies (this is also common in satellite systems).
Secondary. The smaller or dimmer component of a pair of celestial objects that orbits the primary object.
Selenography. The study of the Moon's surface.
second of arc: An angular measure; each minute of arc is divided into 60 seconds of arc.
secondary atmosphere: The gasses outgassed from a planet's interior; rich in carbon dioxide.
Second of Arc - A unit of angular measurement equal to 1/60 of a minute of arc or 1/3600 of a degree
Secondary Atmosphere - The atmosphere that forms after a planet has lost any original atmosphere it had ...
Second, select the tab “Opt.' and make sure the “Normal Image' is checked in the “Image orientation' panel.
ARCSECOND (") - Measure for very small angles. 1 arcsecond = 1/60 arcminute = 1/3600 degree.
ARCUS - Term for an arc-shaped feature on a planetary surface (pl. arcus) ...
The Second Exam
After the first exam you should have developed a better idea of how to study for these things.
Arc second: Another measure of angular separation, - one sixtieth of an arc minute. (1/3600th of a degree.) ...
Second magnitude Polaris, Alpha Ursae Minoris, of Ursa Minor (at the end of the handle of the Little Dipper) is smack in the middle of the picture, which is 6.0 degrees across. Yildun, Delta UMi, is the bright star at upper right.
Second, Triton has a retrograde orbit, which means that it orbits the opposite way the planet spins. This is a very strong indication that Triton was captured. This in itself is not strange; both of Mars' moons were captured.
second of arc (arcsecond)
Measure of angle. A full circle equals 360 degree. 1 degree equals 60 arcminutes. 1 arcminute equals 60 arcseconds.
seeing ...
Second, and this will settle an argument with a coworker :). What is the typical evolution of a cluster of stars forming into a galaxy? My friend seems to think that we start with spirals then move to disks.
secondary mirror - (n.)
The second mirror in a reflecting telescope (after the primary mirror), usually either convex, ...
Second Launch: 2016
Mars Landing: 2017
Launch from Mars: 2017
Earth Return: 2019
Optionally, a sample return mission could be launched earlier.
Second image of the Moon's surface taken by a U.S. Spacecraft
This is the second image of the Moon taken by the Ranger 7 spacecraff. Ranger 7 was the first U.S. spacecraft to successfully transmit images of the lunar surface back to Earth.
Second brightest star in the night sky behind Sirius.
Type of Star:
Yellow-white Supergiant ...
Secondary questions, such as the availability of suitable worlds and chemical precursors, have had much success.
second of arc See "arc second."
Seyfert galaxy Type of active galaxy that exhibits intense energetic activity from a small region within the nucleus of an otherwise normal-looking spiral galaxy.
Second-place winner Johnathan Culpepper won for his painting, "A Busy Day on the Moon.
Second, the gas you deal with will be neither isothermal nor ideal, so they introduce a further difficulty into the equation. However, as written, equation (7) provides a good, first-order approximation to the behavior of gaseous atmospheres.
second largest and the brightest asteroid of the asteroid belt and the fourth such object to be discovered, by the German astronomer and physician Wilhelm Olbers on March 29, 1807. It is named for the ancient Roman goddess of the hearth.
second
atmosphere
Related articles from newspapers, magazines, and more ...
second epoch in the history of the Universe, lasting on the order of a second; named for the heavy elementary particles (protons, neutrons, mesons) that were the most abundant form of matter at the time.
half life - (n.) ...
Second
Realize that there is no one perfect design of telescope to cover all areas of interests. Some compromise must be made in the decision.
Third, do not fall into the "power trap" ...
Secondly, its colour is an unusually deep red, approaching purple. Surrounded by a number of white stars (18, 19, 21 Leo.) its own colour is even more pronounced. Thus R Leonis has become a favourite subject for many variable star observers.
Second in line along the tail is the wide double star Zeta Ursae Majoris. The two members of the double, visible separately with keen eyesight, are called Mizar and Alcor.
Second, because it is so small, the diffraction pattern of a star is not clearly visible unless the observer uses magnification that produces an exit pupil of about 0.8mm or less.
Second, in 1987 a Japanese-American team led by Andrew Lange and Paul Richardson of UC Berkeley and Toshio Matsumoto of Nagoya University made an announcement that CMB was not that of a true black body.
Second corrector lens (negative, BK-7 glass)
(D = 10in, stopped down to 9.8in)
R3 = -72.6in
T3 = 0.375in
R4 = 208.0in ...
A second class of galaxy is the ellipticals. Like spirals, they are named for their shapes: they look like fat, fuzzy footballs.
A second group is comprised of the four innermost satellites—Metis, Adrastea, Amalthea, and Thebe.
A second exit for the bridge, referenced in Franz Joseph's Star Fleet Technical Manual.
Some of the worlds and aliens in the series were included in the 1989 book called The Worlds of the Federation.
 See also: Light, Time, Earth, Sun, Period
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