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Hace 2 días · Astronomy, science that encompasses the study of all extraterrestrial objects and phenomena. Since the late 19th century, astronomy has expanded to include astrophysics, the application of physical and chemical knowledge to an understanding of the nature of celestial objects.
- The Techniques of Astronomy
Astronomy - Techniques, Observations, Measurements:...
- History of Astronomy
Astronomy - Ancient, Celestial, Observations: Astronomy was...
- The Rise of Astrophysics
Astronomy - Stars, Galaxies, Cosmology: In 1835 the French...
- The Steady-state Challenge
Astronomy - Steady State, Cosmology, Big Bang: In England,...
- Study of the Solar System
Astronomy - Solar System, Planets, Stars: The solar system...
- Cosmology
Cosmology, the field of study that brings together the...
- Satellite Observatories
Astronomy - Satellite, Observatories, Exploration: By...
- Copernicus
Astronomy - Copernicus, Heliocentric, Revolution: Polish...
- The Techniques of Astronomy
Hace 2 días · The universe is all of space and time [a] and their contents. [10] It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of energy and matter, and the structures they form, from sub-atomic particles to entire galactic filaments. Space and time, according to the prevailing ...
Hace 17 horas · The Moon is Earth 's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Over time Earth's gravity has caused tidal locking, causing the same side of the Moon to always face Earth.
Hace 1 día · Space exploration is the use of astronomy and space technology to explore outer space. While the exploration of space is currently carried out mainly by astronomers with telescopes, its physical exploration is conducted both by uncrewed robotic space probes and human spaceflight.
Hace 1 día · Solar system, assemblage consisting of the Sun and those bodies orbiting it: 8 planets with about 210 known planetary satellites; many asteroids, some with their own satellites; comets and other icy bodies; and vast reaches of highly tenuous gas and dust known as the interplanetary medium.
Hace 2 días · This article traces the development over time of humanity’s perception of the universe, from prehistoric observations of the night sky to modern calculations on the recessional velocity of galaxies. For articles on component parts of the universe, see solar system, star, galaxy, and nebula.
Hace 1 día · Earth Information Center. For more than 50 years, NASA satellites have provided data on Earth's land, water, air, temperature, and climate. NASA's Earth Information Center allows visitors to see how our planet is changing in six key areas: sea level rise and coastal impacts, health and air quality, wildfires, greenhouse gases, sustainable energy, and agriculture.
