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The Solar System [d] is the gravitationally bound system of the Sun and the objects that orbit it. [11] It formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.
The solar mass (M ☉) is a standard unit of mass in astronomy, equal to approximately 2 × 10 30 kg (2 nonillion kilograms in US short scale). It is approximately equal to the mass of the Sun.
The Paranal Observatory of European Southern Observatory shooting a laser guide star to the Galactic Center. Astronomy is a natural science that studies celestial objects and the phenomena that occur in the cosmos. It uses mathematics, physics, and chemistry in order to explain their origin and their overall evolution.
The study of light, known as optics, is an important research area in modern physics. The main source of natural light on Earth is the Sun . Historically, another important source of light for humans has been fire , from ancient campfires to modern kerosene lamps .
This is an accepted version of this page This is the latest accepted revision, reviewed on 10 January 2025. Scientific projections regarding the far future Several terms redirect here. For other uses, see List of numbers and List of years. Artist's concept of the Earth 5–7.5 billion years from now, when the Sun has become a red giant While the future cannot be predicted with certainty ...
Bach wrote the cantata in his second year in Leipzig for the 19th Sunday after Trinity. [2] [3] [4] It is part of his chorale cantata cycle.The prescribed readings for the Sunday were from Paul's Epistle to the Ephesians – "put on the new man, which after God is created" (Ephesians 4:22–28) – and from the Gospel of Matthew, Healing the paralytic at Capernaum (Matthew 9:1–8).
[19] P.L. 114-329 also provided federal agencies with the “explicit authority to use crowdsourcing and citizen science … to advance federal science agency missions and stimulate and facilitate broader public participation in the innovation process” [20] Challenge.gov contains a listing of active federal challenge and prize competitions.
7-Methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene (mTBD) is a bicyclic strong guanidine base (pK a = 25.43 in CH 3 CN and pK a = 17.9 in THF). [ 3 ] mTBD, like 1,5,7-triazabicyclo[4.4.0]dec-5-ene and other guanidine super bases, can be used as a catalyst in a variety of chemical reactions. [ 4 ]