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For supernovae at redshift less than around 0.1, or light travel time less than 10 percent of the age of the universe, this gives a nearly linear distance–redshift relation due to Hubble's law. At larger distances, since the expansion rate of the universe has changed over time, the distance-redshift relation deviates from linearity, and this ...
The former distance is about 4 billion light-years, much smaller than ct, whereas the latter distance (shown by the orange line) is about 28 billion light-years, much larger than ct. In other words, if space were not expanding today, it would take 28 billion years for light to travel between Earth and the quasar, while if the expansion had ...
The Alcubierre drive ([alkuˈβjere]) is a speculative warp drive idea according to which a spacecraft could achieve apparent faster-than-light travel by contracting space in front of it and expanding space behind it, under the assumption that a configurable energy-density field lower than that of vacuum (that is, negative mass) could be created.
Some models predict the formation of stable positronium atoms with diameters greater than the observable universe's current diameter (roughly 6 × 10 34 metres) [42] in 10 98 years, and that these will in turn decay to gamma radiation in 10 176 years. [5] [6] Supermassive black holes are expected to outlast proton decay, but will eventually ...
The spatial slices are expanding very fast to cover huge volumes. Things are constantly moving beyond the cosmological horizon, which is a fixed distance away, and everything becomes homogeneous. As the inflationary field slowly relaxes to the vacuum, the cosmological constant goes to zero and space begins to expand normally.
The world has been warming faster than expected. Scientists now think they know why ... This phenomenon is called “albedo” and refers to the ability of surfaces to reflect the sun’s energy ...
Such recession speeds do not correspond to faster-than-light travel. Many popular accounts attribute the cosmological redshift to the expansion of space. This can be misleading because the expansion of space is only a coordinate choice. The most natural interpretation of the cosmological redshift is that it is a Doppler shift. [96]
Payload notes that Neutron is expected to cost $50 million to $55 million, so cheaper than SpaceX's Falcon 9 at $70 million. Granted, Neutron isn't as big as Falcon 9. It can only carry a payload ...