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A radar map of the distances ( ) and positions ( ) of all known stellar bodies or systems within 9 light years (ly) (for within 12 ly see this map). Their distances are entered outward from the Sun (Sol) between concentric circles, each representing one ly, and arranged clockwise in hours of right ascension.
If the Sun–Neptune distance is scaled to 100 metres (330 ft), then the Sun would be about 3 cm (1.2 in) in diameter (roughly two-thirds the diameter of a golf ball), the giant planets would be all smaller than about 3 mm (0.12 in), and Earth's diameter along with that of the other terrestrial planets would be smaller than a flea (0.3 mm or 0. ...
It had been conjectured that the fixed stars were much farther away than the planets. Moon: Moon of a planet 3rd century BC 20 Earth radii (very inaccurate, true=64 Earth radii) Aristarchus of Samos made a measurement of the distance between the Earth and the Moon. The diameter of the Earth had been calculated previously.
Observing the stars and planets at night. Catching a glimpse of the planets will depend on the time of day and their relative distance from the planet at the time. For example, Venus, Saturn and ...
The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun. Most named objects in this list have a diameter of 500 km or more. The Sun, a spectral class G2V main-sequence star; The inner Solar System and the terrestrial planets. 2021 PH27; Mercury. Mercury-crossing minor planets; Venus. Venus-crossing ...
This is a list of known galaxies within 3.8 megaparsecs (12.4 million light-years) of the Solar System, in ascending order of heliocentric distance, or the distance to the Sun. This encompasses about 50 major Local Group galaxies, and some that are members of neighboring galaxy groups , the M81 Group and the Centaurus A/M83 Group , and some ...
Host star system Companion exoplanet (in order from star) Notes and additional planetary observations Name Distance Apparent magnitude (V) Mass (M ☉) Label [note 5] Mass (M E) [note 6] Radius (R 🜨) Semi-major axis Orbital period Eccentricity Inclination (°) Discovery method Discovery year; Sun ° 0.000016: −26.7: 1: Mercury: 0.055: 0. ...
The following are lists of stars. ... By distance (above 100 light-years) List of star systems within 100-150 light-years; List of star systems within 150-200 light ...