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In early December 1899 the Sun and the naked-eye planets appeared to lie within a band 35 degrees wide along the ecliptic as seen from the Earth. As a consequence, over the period 1–4 December 1899, the Moon reached conjunction with, in order, Jupiter, Uranus, the Sun, Mercury, Mars, Saturn and Venus.
Ulysses (/ j uː ˈ l ɪ s iː z / yoo-LISS-eez, UK also / ˈ j uː l ɪ s iː z / YOO-liss-eez) was a robotic space probe whose primary mission was to orbit the Sun and study it at all latitudes. It was launched in 1990 and made three "fast latitude scans" of the Sun in 1994/1995, 2000/2001, and 2007/2008.
The nearest star is 4.2 light-years away, and at 15.341 km/s, the spacecraft travels one light-year in about 19,541 years - during which time the nearby stars will also move substantially. In roughly 42,000 years, Voyager 2 will pass the star Ross 248 (10.30 light-years away from Earth) at a distance of 1.7 light-years. [ 94 ]
Voyager 2 flew by Uranus and was the first spacecraft to visit it. Neptune 25 August 1989 4389 days (12 yr, 6 days) Voyager 2 flew by Neptune and was the first spacecraft to visit it. Voyager 1: Jupiter 5 September 1977 5 March 1979 547 days (1 yr, 6 mo, 1 d) Voyager 1 flew by Jupiter and returned the first detailed images. [94] Saturn 12 ...
The spacecraft came so close to our star that if the distance between Earth and the sun were the length of an American football field, the spacecraft would be about 4 yards from the end zone ...
In February 1992, Ulysses passed close to Jupiter, utilizing its gravity to alter its trajectory and propel it into a high-inclination orbit around the Sun. This enabled the spacecraft to study the Sun's polar regions. Given its distance from the Sun during the mission, Ulysses could not rely on solar panels for power.
The Core phase began a week before the encounter and continued for two days after the encounter. The spacecraft flew by the object at a speed of 51,500 km/h (32,000 mph; 14.3 km/s) and within 3,500 km (2,200 mi). [210] The majority of the science data was collected within 48 hours of the closest approach in a phase called the Inner Core. [207]
The spacecraft was traveling at 17.043 km/s (10.590 mi/s) relative to the Sun. At this rate, it would need about 17,565 years at this speed to travel a single light-year. [76] To compare, Proxima Centauri, the closest star to the Sun, is about 4.2 light-years (2.65 × 10 5 AU) distant. If the spacecraft was traveling in the direction of that ...