Nebula
... Nebulae often develop star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most famous images, the "Pillars of Creation". In these regions the formations of gas, dust and other materials 'clump' together to form larger masses, which attract further matter, and ...
... Nebulae often develop star-forming regions, such as in the Eagle Nebula. This nebula is depicted in one of NASA's most famous images, the "Pillars of Creation". In these regions the formations of gas, dust and other materials 'clump' together to form larger masses, which attract further matter, and ...
1 Introduction - University of Amsterdam
... progenitor state (at the top of the diagram) determines the characteristics of the final explosion and therefore also the nature of the compact object that is left behind. It is not only mass that governs the evolution of massive stars, the initial chemical composition and rotation velocity also pla ...
... progenitor state (at the top of the diagram) determines the characteristics of the final explosion and therefore also the nature of the compact object that is left behind. It is not only mass that governs the evolution of massive stars, the initial chemical composition and rotation velocity also pla ...
Mathematica - Press Center
... visible on the bottom right. The blue line near the bottom is the ecliptic, which is the fixed path of the Sun through the sky. The planets and Moon all roughly move along that line as ...
... visible on the bottom right. The blue line near the bottom is the ecliptic, which is the fixed path of the Sun through the sky. The planets and Moon all roughly move along that line as ...
Measuring the Stars Section 29.2
... The classification of stars by absolute magnitude allows comparisons that are based on how bright the stars would appear at equal distances from an observer. The disadvantage of absolute magnitude is that it can be calculated only when the actual distance to a star is known. ...
... The classification of stars by absolute magnitude allows comparisons that are based on how bright the stars would appear at equal distances from an observer. The disadvantage of absolute magnitude is that it can be calculated only when the actual distance to a star is known. ...
Pluto and the Galactic Center
... against classifying it as a planet is its small size, since Pluto is the smallest planet of our solar system, its diameter being about 2/3 that of the Earth’s Moon, and 2/11 of the Earth’s diameter. It takes about 248 years to complete its orbit around the Sun. Its average distance from the Sun is a ...
... against classifying it as a planet is its small size, since Pluto is the smallest planet of our solar system, its diameter being about 2/3 that of the Earth’s Moon, and 2/11 of the Earth’s diameter. It takes about 248 years to complete its orbit around the Sun. Its average distance from the Sun is a ...
The Final Version of the White Paper is available.
... signatures has paradoxically pushed this area into the "photon-starved" regime with current facilities, making the collecting area of the E-ELT essential for achieving the ambitious goals. The key requirements for this science case are a spectral resolution R~100,000 (primarily to disentangle the ex ...
... signatures has paradoxically pushed this area into the "photon-starved" regime with current facilities, making the collecting area of the E-ELT essential for achieving the ambitious goals. The key requirements for this science case are a spectral resolution R~100,000 (primarily to disentangle the ex ...
Earth, moon and sun
... star that appears close to some object such as a house, you will soon see that the star either disappears behind the house or appears to move further away from it. It appears that the stars are moving from east to west, like the sun and moon. However, it is the Earth that is rotating—the stars don’t ...
... star that appears close to some object such as a house, you will soon see that the star either disappears behind the house or appears to move further away from it. It appears that the stars are moving from east to west, like the sun and moon. However, it is the Earth that is rotating—the stars don’t ...
MOON PRACTICE MULTIPLE CHOICE
... Scientists studying a Sun-like star named Ogle-Tr-3 discovered a planet that is, on the average, 3.5 million kilometers away from the star’s surface. The planet was discovered as a result of observing a cyclic decrease in the brightness of Ogle-Tr-3 every 28.5 hours. The changing brightness is the r ...
... Scientists studying a Sun-like star named Ogle-Tr-3 discovered a planet that is, on the average, 3.5 million kilometers away from the star’s surface. The planet was discovered as a result of observing a cyclic decrease in the brightness of Ogle-Tr-3 every 28.5 hours. The changing brightness is the r ...
1. Uranus and Neptune
... Once Neptune’s actual distance (about 2,792 million miles from the Sun or about thirty times our own distance from the Sun) was determined and its size and motions all worked out, its gravitational pull on Uranus could be calculated. And behold, Uranus’s supposed error in motion was explained away. ...
... Once Neptune’s actual distance (about 2,792 million miles from the Sun or about thirty times our own distance from the Sun) was determined and its size and motions all worked out, its gravitational pull on Uranus could be calculated. And behold, Uranus’s supposed error in motion was explained away. ...
What did we learn from transiting planets?
... Department of Astrophysical Sciences --- Princeton University ...
... Department of Astrophysical Sciences --- Princeton University ...
Asteroids, Comets, and Meteorites: Cosmic Invaders of the Earth
... Celsius), the temperature at which all molecular motion ceases. Faint temperature fluctuations in the background microwave radiation might signify primordial lumps that later gave rise to the present-day galaxies. ...
... Celsius), the temperature at which all molecular motion ceases. Faint temperature fluctuations in the background microwave radiation might signify primordial lumps that later gave rise to the present-day galaxies. ...
Variable Stars – II. Pulsating stars
... 15000K). Clearly, these would not work for O stars where such zones would be on the surface of the star (if they existed; we can see that hydrogen is mostly ionized in an O star atmosphere). Even for the much cooler classical Cepheid stars (δ Cepheids), the driving zone is believed to be the second ...
... 15000K). Clearly, these would not work for O stars where such zones would be on the surface of the star (if they existed; we can see that hydrogen is mostly ionized in an O star atmosphere). Even for the much cooler classical Cepheid stars (δ Cepheids), the driving zone is believed to be the second ...
Starting Out in Astronomy Observing the Moon Darkness Over Africa
... planets, and six are visible to the naked-eye - Mercury, Venus, Mars, Jupiter, Saturn and sometimes Uranus. The planets are different to stars in several ways. A star may be defined as a luminous, gaseous body, that generates energy by means of nuclear fusion reactions in its core. A planet on the o ...
... planets, and six are visible to the naked-eye - Mercury, Venus, Mars, Jupiter, Saturn and sometimes Uranus. The planets are different to stars in several ways. A star may be defined as a luminous, gaseous body, that generates energy by means of nuclear fusion reactions in its core. A planet on the o ...
Kepler Mission
... temperature of HAT-P-7b; the temperature is 3160 Kelvin, similar to that of a very cool star partly caused by its closeness to Kepler 2 which has a photospheric temperature of 6350 Kelvin, a temperature greater than our own Sun. Kepler 2 is larger than the Sun (1.991 solar radii) and more massive (1 ...
... temperature of HAT-P-7b; the temperature is 3160 Kelvin, similar to that of a very cool star partly caused by its closeness to Kepler 2 which has a photospheric temperature of 6350 Kelvin, a temperature greater than our own Sun. Kepler 2 is larger than the Sun (1.991 solar radii) and more massive (1 ...
Hands-On Activities
... Mars: the fourth planet from the Sun in the solar system, named after the Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. Mercury: The innermost and smallest planet in the solar system (since Pluto was re-labeled as a dwarf planet), ...
... Mars: the fourth planet from the Sun in the solar system, named after the Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. Mercury: The innermost and smallest planet in the solar system (since Pluto was re-labeled as a dwarf planet), ...
Asteroids and Comets and Meteors, Oh My!
... Why do we have meteor showers? They happen when the Earth passes through the tail of a comet. Like the dust cloud surrounding Pigpen in the “Peanuts” comics, a meteoroid stream travels along with the comet on its orbit through the Solar System. Some people are confused by comets and meteors. A comet ...
... Why do we have meteor showers? They happen when the Earth passes through the tail of a comet. Like the dust cloud surrounding Pigpen in the “Peanuts” comics, a meteoroid stream travels along with the comet on its orbit through the Solar System. Some people are confused by comets and meteors. A comet ...
Rare Earth hypothesis
In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events and circumstances. The hypothesis argues that complex extraterrestrial life is a very improbable phenomenon and likely to be extremely rare. The term ""Rare Earth"" originates from Rare Earth: Why Complex Life Is Uncommon in the Universe (2000), a book by Peter Ward, a geologist and paleontologist, and Donald E. Brownlee, an astronomer and astrobiologist, both faculty members at the University of Washington.An alternative view point was argued by Carl Sagan and Frank Drake, among others. It holds that Earth is a typical rocky planet in a typical planetary system, located in a non-exceptional region of a common barred-spiral galaxy. Given the principle of mediocrity (also called the Copernican principle), it is probable that the universe teems with complex life. Ward and Brownlee argue to the contrary: that planets, planetary systems, and galactic regions that are as friendly to complex life as are the Earth, the Solar System, and our region of the Milky Way are very rare.