- BIO Web of Conferences
... the nature of the organic material: On Earth, this ratio is 89 in the rocks, but higher (about 92) in living organisms. This difference is a result of photosynthesis, because the lighter isotope 12C is used preferentially when CO2 is transformed under solar light into organics. The 12C/13C could be ...
... the nature of the organic material: On Earth, this ratio is 89 in the rocks, but higher (about 92) in living organisms. This difference is a result of photosynthesis, because the lighter isotope 12C is used preferentially when CO2 is transformed under solar light into organics. The 12C/13C could be ...
Lecture 12-13: Planetary atmospheres
... o For Earth, gives a “hot” side to the planet, with an average temperature of >330 K. o The “cold” side of a tidally locked planet would have extremely low temperatures. Strong winds would act to redistribute heat between hemispheres. o There would also be a latitudinal variation of heating. The ...
... o For Earth, gives a “hot” side to the planet, with an average temperature of >330 K. o The “cold” side of a tidally locked planet would have extremely low temperatures. Strong winds would act to redistribute heat between hemispheres. o There would also be a latitudinal variation of heating. The ...
planet
... • What does clear the neighborhood really mean? – Earth, Mars, Jupiter and Neptune all have asteroids as neighbors (in similar orbits) ...
... • What does clear the neighborhood really mean? – Earth, Mars, Jupiter and Neptune all have asteroids as neighbors (in similar orbits) ...
Our Solar System and Beyond
... — The bombardment of newly formed planets by planetesimals may explain the exceptions. — Material torn from Earth’s crust by a giant impact formed the Moon. • When did the planets form? — Radiometric dating indicates that planets formed 4.5 ...
... — The bombardment of newly formed planets by planetesimals may explain the exceptions. — Material torn from Earth’s crust by a giant impact formed the Moon. • When did the planets form? — Radiometric dating indicates that planets formed 4.5 ...
Transits of extrasolar moons around luminous giant planets
... giant exoplanets are found in extremely short-period orbits (the “hot Jupiters”); and stellar radial velocity (RV) measurements suggest that giant planets around Sun-like stars can migrate to 1 AU, where we observe them today. Moreover, at least one large moon, Triton, has probably been formed throu ...
... giant exoplanets are found in extremely short-period orbits (the “hot Jupiters”); and stellar radial velocity (RV) measurements suggest that giant planets around Sun-like stars can migrate to 1 AU, where we observe them today. Moreover, at least one large moon, Triton, has probably been formed throu ...
New Worlds - Universiteit Leiden
... scientists are sometimes forced by new insights to retract earlier claims, proved much more difficult than expected. But this is at the core of doing science. The new definition also has the advantage that school children now only have to remember the name of 8 planets, rather than ...
... scientists are sometimes forced by new insights to retract earlier claims, proved much more difficult than expected. But this is at the core of doing science. The new definition also has the advantage that school children now only have to remember the name of 8 planets, rather than ...
The Search for Another Earth
... be floating freely while some planets are discovered around binary stars. ...
... be floating freely while some planets are discovered around binary stars. ...
No. 53 - Institute for Astronomy
... the Earth’s orbit to stabilize the spacecraft. Kepler is back to mining the cosmos for planets by searching for eclipses, or transits, as planets orbit in front of their host stars and periodically block some of the starlight. Kepler sees only a small fraction of the planetary systems in its gaze, t ...
... the Earth’s orbit to stabilize the spacecraft. Kepler is back to mining the cosmos for planets by searching for eclipses, or transits, as planets orbit in front of their host stars and periodically block some of the starlight. Kepler sees only a small fraction of the planetary systems in its gaze, t ...
Class 1 and 2 lecture slides (Solar System Formation)
... • As the nebula collapses, it forms a spinning disk (due to conservation of angular momentum) • The collapse releases gravitational energy, which heats the centre; this central hot portion forms a star • The outer, cooler particles suffer repeated collisions, building planet-sized bodies from dust g ...
... • As the nebula collapses, it forms a spinning disk (due to conservation of angular momentum) • The collapse releases gravitational energy, which heats the centre; this central hot portion forms a star • The outer, cooler particles suffer repeated collisions, building planet-sized bodies from dust g ...
Chapter 15 The Formation of Planetary Systems
... A different method for detecting planets: Transits An extrasolar planet may also be detected if its orbit lies in the plane of the line of sight to us. The planet will then eclipse the star, and if the planet is large enough, a (very small!) decrease in luminosity may be observed as a function of t ...
... A different method for detecting planets: Transits An extrasolar planet may also be detected if its orbit lies in the plane of the line of sight to us. The planet will then eclipse the star, and if the planet is large enough, a (very small!) decrease in luminosity may be observed as a function of t ...
3/r -- this talks about the surface area vs the volume of a planet
... mean solar time is defined so that noon occurs at the time which the sun would cross the meridian on average mean and solar times agree only 4 times a year - mean time can be as much as 17 min behind or 15 min ahead the sun. Both solar and mean times are LOCAL times, different in each city. (time zo ...
... mean solar time is defined so that noon occurs at the time which the sun would cross the meridian on average mean and solar times agree only 4 times a year - mean time can be as much as 17 min behind or 15 min ahead the sun. Both solar and mean times are LOCAL times, different in each city. (time zo ...
Astronomers have found two worlds around distant stars with such
... So how can we gather weather reports from worlds we can’t even see directly? They’re so far away their faint glow is completely blurred together with the much brighter light of their host stars. It’s like trying to study a golf ball next to a searchlight. That’s a hundred miles away. Using binocular ...
... So how can we gather weather reports from worlds we can’t even see directly? They’re so far away their faint glow is completely blurred together with the much brighter light of their host stars. It’s like trying to study a golf ball next to a searchlight. That’s a hundred miles away. Using binocular ...
Origin of the Solar System
... The Nebular Theory Planetesimals and Protoplanets The nebular theory also explains how the planets could have formed. Weak surface forces held dust grains together, forming loose balls of dust. As these balls of dust collided, they grew larger and larger. ...
... The Nebular Theory Planetesimals and Protoplanets The nebular theory also explains how the planets could have formed. Weak surface forces held dust grains together, forming loose balls of dust. As these balls of dust collided, they grew larger and larger. ...
Solar System Teacher Tips
... causes the tides in the Earth’s oceans. Kuiper Belt: a band of icy rocks (including most planetoids) that orbit the Sun, extending from the orbit of Neptune to the Oort Cloud. Meteor: meteoroid burning as it enters a planet’s atmosphere (commonly, but incorrectly identified as “shooting stars”). Met ...
... causes the tides in the Earth’s oceans. Kuiper Belt: a band of icy rocks (including most planetoids) that orbit the Sun, extending from the orbit of Neptune to the Oort Cloud. Meteor: meteoroid burning as it enters a planet’s atmosphere (commonly, but incorrectly identified as “shooting stars”). Met ...
Document
... their respective orbital motions, as also the smaller moon Amalthea. The first three Galilean satellites, Io, Europa, and Ganymede are stably locked together in orbital resonances, such that Io’s angular velocity is ~twice that of Europa, and Europa’s ~twice that of Ganymede’s [(Io) - 3(Europa) + ...
... their respective orbital motions, as also the smaller moon Amalthea. The first three Galilean satellites, Io, Europa, and Ganymede are stably locked together in orbital resonances, such that Io’s angular velocity is ~twice that of Europa, and Europa’s ~twice that of Ganymede’s [(Io) - 3(Europa) + ...
Solar System Formation
... • About 4.5 billion years ago it is believed that the Solar System consisted of a large cloud of gas and dust, called a nebula. • This cloud started rotating, and the dust particles combined to form planetesimals. As the cloud rotated faster, it flattened, and the planetesimals formed. • The Sun is ...
... • About 4.5 billion years ago it is believed that the Solar System consisted of a large cloud of gas and dust, called a nebula. • This cloud started rotating, and the dust particles combined to form planetesimals. As the cloud rotated faster, it flattened, and the planetesimals formed. • The Sun is ...