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A Journey to the End of Time

The Solar System in 3D, in real time

A simulation of the Solar System driven by real ephemerides. The Sun, the planets, Pluto and the major moons, space probes, the International Space Station, nearby stars and the black hole at the centre of the Milky Way are where they really are at the chosen moment. You can run time from 1700 to 2100, fly from one object to another and look at the sky from anywhere on Earth.

Arcturus

Star

Facts

Distance
36.9 light-years
Spectral class
K1.5 III
Diameter
about 25 times the Sun
Surface temperature
4295 K
Apparent magnitude
−0.04

Arcturus is an orange giant of spectral class K1.5 III, about 37 light-years from Earth: the brightest star in the northern celestial hemisphere and the third brightest in the night sky.

Its surface is cooler than the Sun's, about 4000 °C against 5500, but the star is much larger: its diameter is about 25 times the Sun's.

Sources