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Hace 19 horas · One-minute path of asteroid 4179 Toutatis in the sky during its September 2004 close approach (Paranal Observatory) These are asteroids in a near-Earth orbit without the tail or coma of a comet. As of March 2024 [update] , 34,603 near-Earth asteroids (NEAs) are known, 2,406 of which are both sufficiently large and may come sufficiently close to Earth to be classified as potentially hazardous.
Hace 19 horas · Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of ionised helium and highly ionised nitrogen or carbon. The spectra indicate very high surface enhancement of heavy elements, depletion of hydrogen, and strong stellar winds.
Hace 19 horas · Skylab had a mass of 199,750 pounds (90,610 kg) with a 31,000-pound (14,000 kg) Apollo command and service module (CSM) attached and included a workshop, a solar observatory, and several hundred life science and physical science experiments.
Hace 19 horas · La orbita periodo de (137170) 1999 HF1 estas 1/16 de tiu de Jupitero, ĝi do estas en orbitaj resonancoj 5/6 kun Venuso kaj 4:3 kun la Tero . Ĝia discentra orbito ekstere tanĝas tiun de Merkuro kaj krucas tiujn de Venuso kaj de la Tero. Ĝia granda orbita klineco tenas ĝin malproksima de Merkuro kaj de la Tero; kompense la suprenira nodo de ...
