1
Large spiral system consisting of several hundred billion stars, one of which is the Sun.
2
An element with an atomic number greater than 92.
3
A hypothesis concerning the formation of stars and planets, and therefore the origin of the solar system, according to which a rotating nebula underwent gravitational collapse into a star with an accretion disk, from which planets condensed or formed by coagulation of dust particles into increasingly larger bodies.
4
The universe may have been created in a huge explosion at least 12 billion years ago.
5
The gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly.
6
The nature of something's ingredients or constituents; the way in which a whole or mixture is made up.
7
According to the proportions of an established scale of measurement.
