closest approach distance
21Nibiru collision — This article is about the doomsday scenario. For other uses, see Nibiru. V838 Mon, a star with an expanding light echo, purported as photographic evidence of Nibiru The Nibiru collision is a supposed disastrous encounter between the Earth and a… …
22Solar System — This article is about the Sun and its planetary system. For other systems, see planetary system and star system. For a list of physical and orbital statistics for the Solar System s largest bodies, see List of gravitationally rounded objects of… …
23C/2010 X1 — For beliefs regarding a supposed collision between Earth and Comet Elenin, see Nibiru collision. C/2010 X1 (Elenin) Comet Elenin as seen by the STEREO B spacecraft on August 1st, 2011. Discovery Discovered by: Leonid Elenin 0.45 m reflector (H15) …
24Newton's theorem of revolving orbits — Figure 1: An attractive force F(r) causes the blue planet to move on the cyan circle. The green planet moves three times faster and thus requires a stronger centripetal force, which is supplied by adding an attractive inverse cube force. The …
25Mars hoax — The Mars hoax was an e mail circulated hoax that originated in 2003, claiming that Mars will look as large as the full Moon to the naked eye on August 27, 2003. The hoax, which has since resurfaced in every year from 2005 2011, stemmed from a… …
26geometry — /jee om i tree/, n. 1. the branch of mathematics that deals with the deduction of the properties, measurement, and relationships of points, lines, angles, and figures in space from their defining conditions by means of certain assumed properties… …
27star — starless, adj. /stahr/, n., adj., v., starred, starring. n. 1. any of the heavenly bodies, except the moon, appearing as fixed luminous points in the sky at night. 2. Astron. any of the large, self luminous, heavenly bodies, as the sun, Polaris,… …
28Mercury (planet) — Mercury  ☿ …
29Barnard's Star — The location of Barnard s Star Observation data Epoch J2000.0      Equinox J2000.0 …
30Halley's Comet — For the video game, see Halley s Comet (video game). 1P/Halley (Halley s Comet) Halley s Comet on March 8, 1986 Discovery …
