The specific issues that I addressed in my Ph.D. thesis were all associated with, or at least motivated by, problems in theoretical astrophysics, gravitational dynamics in particular: the evolution of
the orbits of planets in the solar system and the evolution of structure in galaxies.
A SUBTLE anomaly in
the orbit of the planets in our solar system could prove a controversial idea that goes beyond Einstein.
Like the waistband of a couch potato in midlife,
the orbits of planets in our solar system are expanding.
Scientists using NASA's Kepler space telescope identified a regular pattern in
the orbits of the planets in the TRAPP... read more
Unfortunately, current estimates of the masses and orbits of Stars A and B — whose large margins of errors result in significant uncertainty — suggest that
the orbit of a planet in the habitable zone of Star A could be disrupted.
Not exact matches
While the
Planet Labs staff ate pancakes that morning
in February, two shoebox - size nine - pound pods made
in the company's unconventional factory floated from the International Space Station toward a polar
orbit of Earth.
Juno will fly
in highly elliptical
orbits that will pass within 3,000 miles (4,800 km)
of the tops
of Jupiter's clouds and inside the
planet's powerful radiation belts.
In terms of visibility, your goal is to be in a kind of celestial sweet spot where you are orbiting not too far away from the big planets or the smaller ones (so you can keep an eye on both), but not so close that you get pulled by gravity into them (and crash
In terms
of visibility, your goal is to be
in a kind of celestial sweet spot where you are orbiting not too far away from the big planets or the smaller ones (so you can keep an eye on both), but not so close that you get pulled by gravity into them (and crash
in a kind
of celestial sweet spot where you are
orbiting not too far away from the big
planets or the smaller ones (so you can keep an eye on both), but not so close that you get pulled by gravity into them (and crash).
Eighty - eight
of those small satellites were the property
of Planet; with these eyes on the sky, along with the 50 they already had
in orbit, the company promises its customers high - resolution images
of the Earth for everything from crop yield monitoring to aiding first responders with real - time images
of natural disasters.
Planet owns and operates the largest private satellite fleet
in orbit, and provides the most consistently up - to - date images
of our Earth's surface
Launched
in October 1997, the Cassini mission to Saturn included a sophisticated robotic spacecraft that
orbited the ringed
planet and provided streams
of data about its rings, magnetosphere, moon Titan and icy satellites.
«Tycho Brahe, Johannes Kepler and Edmond Halley were pioneers
in describing the
orbits of comets and
planets.
Oh, so
in the vast known Universe, which reaches out for 15 BILLION light years
in all directions, with over 100 BILLION galaxies, containing an average
of 100 BILLION stars each, with most
of those stars now thought to have multiple
planets orbiting around them, you can't imagine that there would be at least ONE little
planet SOMEWHERE with the right conditions for life without divine intervention?
Copernicus's posthumous fame,
of course, arose from his 30 - year project published soon before his death, De Revolutionibus Orbium Coelestium - a revolution indeed,
in which he explained his calculations that proved that the earth and
planets orbit the sun, rather than the sun and
planets orbitthe earth.
For example, William Paley, already
in 1802,
in his treatise Natural Theology, pointed out that if the law
of gravity had not been a so «called «inverse square law» then the earth and the other
planets would not be able to remain
in stable
orbits around the sun.
Picking his way expertly through three centuries
of scientific history, from Newton on gravity (the force that causes apples to fall and
planets to stay
in orbit is the same), through electricity and magnetism (aspects
of a single reality), to the present search for a Grand Unified Theory, he argued that the coherence
of the physical universe progressively uncovered by science points to a «unity principle» at its heart.
We are a Goldie Loc's
Planet 2 - we got the right
of land to water ratio 3 - the moon is at the right size and
orbit to prevent the earth from wobbling 4 - the gas giants
in our solar system do a great job at cleaning up roaming ice and rock that is flying around our solar system 5 - right distance from the galactic core.
I can explain climate change as a result
of a natural cycle caused by the masses and
orbits of the
planets, but I don't go around calling believers
in humans causing climate change idiots simply because I know what actually causes it.
Calculations indicate that
in several ways it is quite an Earth - like
planet: its radius is 1.2 to 2.5 times that
of Earth; its mass is 3.1 to 4.3 times greater; and, crucially, its
orbit lies within its star's «Goldilocks zone», which means its surface temperature is neither too hot nor too cold for liquid water - and therefore potentially life - to exist on its surface.
Like conic sections, which had to wait nearly two thousand years for their first important application
in Kepler's description
of the elliptical
orbits of the
planets, perhaps the trinitarian conceptuality, at least with regard to the problem
of transcendence and immanence, first comes into its own
in our situation.
One insignificant
planet orbiting one insignificant star out
of billions,
in one insignificant galaxy out
of billions
of other galaxies, and we are somehow the sole focus
of a greater being that by all accounts has not had any provable direct communication with mankind, ever?
The views
of Copernicus did not depart completely from the Aristotelian picture
of the universe
in that he still regarded the
planets as moving
in circular
orbits round the sun.
The nightmarish spectre
of Antonio Conte's hauntingly terrifying face leering into the camera for an interview where He visibly battles with his urge to discuss the upcoming Champions League match with Barcelona rather than the humiliation
of a Hull side without endangering any
of his important players, was enough to prompt Mark to gaze heavenward, longing for the rumoured «
Planet X» to finally roam into our
orbit and take out earth
in an apocalyptic planetary collision which the FA Cup would likely somehow survive.
The premise
of a ballistic capture: Instead
of shooting for the location Mars will be
in its
orbit where the spacecraft will meet it, as is conventionally done with Hohmann transfers, a spacecraft is casually lobbed into a Mars - like
orbit so that it flies ahead
of the
planet.
Based on these analyses, A / 2017 U1 came from the direction
of the constellation Lyra, swooping
in from high above the ecliptic plane
in which the sun's
planets orbit at a breathtaking 25 kilometers per second.
All were discovered
in the first decade
of the nineteenth century, and all were considered
planets until the 1860s, when a tide
of discoveries
of ever - smaller objects
in similar
orbits demoted them to the rank
of mere asteroids.
When a
planet orbits in front
of its host star, it temporarily blocks a tiny portion
of starlight, and these dips will be recorded by TESS» four ultrasensitive cameras.
When astronomers
in February announced the discovery
of seven
planets orbiting a supercool star, details about the outermost
planet were sketchy.
Astronomers conducting a galactic census
of planets in the Milky Way now suspect most
of the universe's habitable real estate exists on worlds
orbiting red dwarf stars, which are smaller but far more numerous than stars like our Sun.
Artist's interpretation
of a hypothetical moon
in orbit around a
planet found
in a tight - knit triple - star system.
This picture is a closeup
of a part
of the material
in the hole, and it may very well be that the blue spot is a
planet, and the red swirl is material falling onto the
planet -
in other words, the
planet is still forming from junk
orbiting the star!
THE WOODLANDS, TEXAS — The stately solar system
of today was
in turmoil
in its first several million years, theorists believe, with giant
planets sowing chaos as they strayed far from their current
orbits.
The KELT monitors bright stars
in large sections
of the sky, searching for
planets that
orbit extremely closely.
Most
of the
planets in the Solar System have smaller bodies, or satellites, that
orbit a
planet.
Carr and the other research team members set out to study the protoplanetary disk around a star known as HD 100546, and as sometimes happens
in scientific inquiry, it was by «chance» that they stumbled upon the formation
of the
planet orbiting this star.
The discovery
of seven Earth - sized
planets orbiting a single cool star fuels a debate over what counts as good news
in the search for life outside the solar system.
Throughout his stay, Scott Kelly invited the world to join him (virtually) on the ISS, and he provided us with an intimate glimpse
of life
in orbit and our
planet.
The solar system
of today was
in turmoil
in its first several million years, theorists believe, with giant
planets sowing chaos as they strayed far from their current
orbits.
The International Astronomical Union defines «
planet» as a celestial body that, within the Solar System that is
in orbit around the Sun; has sufficient mass for its self - gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape; and has cleared the neighbourhood around its
orbit; or within another system, it is
in orbit around a star or stellar remnants; has a mass below the limiting mass for thermonuclear fusion
of deuterium; and is above the minimum mass / size requirement for planetary status
in the Solar System.
Scientists don't fully understand what's driving Jupiter's strongest auroras, but data gathered by the
orbiting Juno spacecraft hint that the electrons generating Jupiter's polar glows may be accelerated by turbulent waves
in the
planet's magnetic field — a process somewhat akin to surfers being driven shoreward ahead
of breaking ocean waves, the researchers report today
in Nature.
He is also part
of a NASA team that will soon be using the Transiting Exoplanet Survey Satellite (TESS) to find Earth - like
planets orbiting in or near the habitable zone
of their stars.
The researchers believe the presence
of multiple stars
in a system could be a clue as to how
planets finally settle into their
orbits.
Our analysis strongly suggests we are observing a disk
of hot gas that surrounds a forming giant
planet in orbit around the star.
Dubbed Kepler 438 b and Kepler 442 b, both
planets appear to be rocky and
orbit in the not - too - hot, not - too - cold habitable zones
of their stars where liquid water can exist
in abundance.
But it could later switch to satellites like the 28 imaging cubesats that the firm
Planet Labs
of San Francisco already has
in orbit.
But on top
of that, the
orbits of the six objects are also all tilted
in the same way — pointing about 30 degrees downward
in the same direction relative to the plane
of the eight known
planets.
But the real kicker for the researchers was the fact that their simulations also predicted that there would be objects
in the Kuiper Belt on
orbits inclined perpendicularly to the plane
of the
planets.
At the fall meeting
of the American Geophysical Union on Dec. 13, 2017,
in New Orleans, Louisiana, Brain described how insights from the MAVEN mission could be applied to the habitability
of rocky
planets orbiting other stars.
Brain and his colleagues started to think about applying these insights to a hypothetical Mars - like
planet in orbit around some type
of M - star, or red dwarf, the most common class
of stars
in our galaxy.
Although it isn't possible today to say whether the
planets harbor life, astronomers are excited because each
planet's
orbit passes
in front
of — or «transits» — its parent star.