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Miyake event. A Miyake event is an observed sharp enhancement of the production of cosmogenic isotopes by cosmic rays. It can be marked by a spike in the concentration of radioactive carbon isotope 14. Cl in ice cores, which are all independently dated. At present, five significant events are known (7176 BCE, 5259 BCE, 660 BCE, 774 CE, 993 CE ...
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Using the values known in 2018 and Planck units for Ω Λ = 0.6889 ± 0.0056 and the Hubble constant H 0 = 67.66 ± 0.42 (km/s)/Mpc = (2.192 7664 ± 0.0136) × 10 −18 s −1, Λ has the value of = = = where is the Planck length. A positive vacuum energy density resulting from a cosmological constant implies a negative pressure, and vice versa.
The discovery of cosmic microwave background radiation constitutes a major development in modern physical cosmology. In 1964, US physicist Arno Allan Penzias and radio-astronomer Robert Woodrow Wilson discovered the cosmic microwave background (CMB) , estimating its temperature as 3.5 K, as they experimented with the Holmdel Horn Antenna .
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PS-99 Karachi East-III (پی ایس-99، کراچی مشرقی-3) is a constituency of the Provincial Assembly of Sindh. [2] [3] General elections 2024 [ edit ]
A free (=) scalar field has =, and one with vanishing kinetic energy is equivalent to a cosmological constant: =. Any equation of state in between, but not crossing the w = − 1 {\displaystyle w=-1} barrier known as the Phantom Divide Line (PDL), [ 2 ] is achievable, which makes scalar fields useful models for many phenomena in cosmology.
A METI message Cosmic Call 2 sent from the 70-metre Eupatoria Planetary Radar arrives at its destination, 55 Cancri. 2044 September Another METI message Cosmic Call 2 sent from the 70-metre Eupatoria Planetary Radar arrives at its destination, HD 10307. 2044 October 1 Occultation of Regulus by Venus. The last was on July 7, 1959, and the next ...