... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

M1 image More About M1 Nice Color Picture . ... M16 image More About M16 HST image . ... M31 image More About M31 Nice Color Picture . ... M42 image ; M43 image More About M42/43 Nice Color CCD Picture . M51 image More About M51 Color Image of M51 M51 Supernova . M57 image More About M57 Nice Color CCD Picture Very Deep M57 Image . ... M81 image More About M81 M81 Supernova Ultraviolet Image of M81 More about Ultraviolet Imaging . M82 image More About M82 M82 False Color M82 True Color . ...

... Mass . 17a. Measuring Mass . ... A medium-size (1.25 inch wide) binder clip, as is used in offices to hold papers together--the type made of flat blue steel, with two wire handles. ... The theory predicts that the oscillation period should be proportional to the square root of the oscillating mass, including the mass of the clip. Note that gravity plays no part here: the oscillation period would be the same on the Moon or in zero-g. Denoting square root by SQRT, we have . ...

Isaac Newton on the British pound note . ... 1) In the absence of forces, a body at rest will stay at rest, and a body moving at a constant velocity in a straight line continues doing so indefinitely. 2) When a force is applied to an object ("body"), it accelerates in the direction of the force. ... The second law gives an explicit formula, and hence is the one most useful. ... Mach argued that Newton's laws boil down to one law: . ... Mass and force are now readily derived. ...

... S.P. KOROLEV ROCKET AND SPACE CORPORATION ENERGIA . ... OAO RSC "Energia" . ... Brief History of Rocket and Space Technology . ... Rocket Space Complexes . ... Images . ... Automatic Space Systems . Universal Space Platform . ... Crew 43/44 . ... Experiments Program . ISS-43 Images . ... Seventeenth Russian Visiting Crew . ... Sixteenth Russian Visiting Crew . ... Eighteenth Crew . ... Fifteenth Russian Visiting Crew . ... Seventeenth Crew . ... 2015 JSC "S.P. Korolev RSC "Energia" . ...

Next: Second priority candidates Up: First priority candidates Previous: Stellar objects . Twenty five non emission-line objects are hard to classify at all. ... Figure: Colour distribution for the random sample of 42 second priority candidates in the strip =35-40 (HS 1423+3945 is not included because its APM-colour is not available). ... BCG/H II -galaxies are marked by an additional cross. 4 of 5 APM stellar-type emission-line objects are either QSOs or distant luminous galaxies. ...

... Since the reddening found for the stars in Table 13 was small, no reddening correction was attempted. ... These diamonds indicate the positions of very low mass, 3 Myr old, objects from the work of Burrows et al. ... This optical V versus R - I scheme is a very powerful method of detecting very low mass (VLM) objects. ... Because of this, young brown dwarfs are intrinsically no more difficult to observe in the optical than low mass stars at the age of Orionis. ...

... We can help students grasp the significance of Hubble's extremely keen eye, and learn a bit about angles and math in the process, with the following in-class activity. ... Looking through binoculars or telescopes allows us to magnify a small section of the sky. To measure sizes or distances in that small section, astronomers divide a degree into 60 smaller pieces called arcminutes, and further subdivide minutes into 60 smaller sections called arcseconds. ... 30 feet = . ... 36 seconds . ...

... December 21, 1997 . ... Advantages are briefly discussed of gaining in spectral resolution, which is accompanied by losses in signal level, as compared with the attempts to improve the accuracy of measurement of line parameters by means of rising the S/N ratio alone with increasing the exposure time. To partially solve the problem of observations of faint objects at the BTA a new design echelle spectrometer is proposed. high resolution spectroscopy . ...