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Contents. Formation and evolution of the Solar System. There is evidence that the formation of the Solar System began about 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. [1] Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary ...
Communication system[edit] The radio communication system of Voyager 1 was designed to be used up to and beyond the limits of the Solar System. It has a 3.7-metre (12 ft) diameter high-gain Cassegrain antenna to send and receive radio waves via the three Deep Space Network stations on the Earth. [21]
K-type main-sequence stars are about three to four times as abundant as G-type main-sequence stars, making planet searches easier. K-type stars emit less total ultraviolet and other ionizing radiation than G-type stars like the Sun (which can damage DNA and thus hamper the emergence of nucleic acid based life). In fact, many peak in the red.
File:Milky-way-edge-on.pdf. Size of this JPG preview of this PDF file: 800 × 590 pixels. Other resolutions: 320 × 236 pixels | 640 × 472 pixels | 943 × 695 pixels. This is a file from the Wikimedia Commons. Information from its description page there is shown below.
According to the IAU definition, there are eight planets in the Solar System, which are (in increasing distance from the Sun): [1] Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Jupiter is the largest, at 318 Earth masses, whereas Mercury is the smallest, at 0.055 Earth masses.
Methods of detecting exoplanets. Number of extrasolar planet discoveries per year through 2022, with colors indicating method of detection: Direct imaging. Microlensing. Transit. Radial velocity. Timing. Any planet is an extremely faint light source compared to its parent star.
Neutron star. Central neutron star at the heart of the Crab Nebula. Radiation from the rapidly spinning pulsar PSR B1509-58 makes nearby gas emit X-rays (gold) and illuminates the rest of the nebula, here seen in infrared (blue and red). A neutron star is a collapsed core of a massive supergiant star.
The Global Positioning System ( GPS ), originally Navstar GPS, [2] is a satellite-based radio navigation system owned by the United States government and operated by the United States Space Force. [3] It is one of the global navigation satellite systems (GNSS) that provide geolocation and time information to a GPS receiver anywhere on or near ...
Composition. The universe is composed almost completely of dark energy, dark matter, and ordinary matter. Other contents are electromagnetic radiation (estimated to constitute from 0.005% to close to 0.01% of the total mass–energy of the universe) and antimatter.