Monday Sept 14
... A planetary system is a star and all of
the planets, moons, and other objects
and materials that orbit that star.
Until very recently, there was only one known planetary system Even though many
People suspected that most stars had planets orbiting them, we had no scientific
evidence to support th ...
Lecture L24 ASTB21
... Arrhenius's ideas prompted a variety of experimental work, such as that of Paul Becquerel, to test
whether spores and bacteria could survive in conditions approximating those in space. A majority of
scientists reached the conclusion that stellar ultraviolet would probably prove deadly to any
... survive the millions of years it takes for rocks to travel from planet to planet."
But Genge, along with other scientists, cautioned that the 250-million-year-old
bacteria found in New Mexican salt crystals are not conclusive. There is a chance
the samples were contaminated with more modern bacteria ...
KOI-3158: An extremely compact system of five
... means that KOI-3158 is part of a hierarchical triple system. The target star oscillates, being
the densest star with detected solar-like oscillations found to date (i.e., having the highest
large frequency separation). We provide precise stellar properties from grid-based modeling, including an aste ...
Part I: Moons, Asteroids, and Comets
2. How many moons are in our solar system?
3. Do all planets have moons?
The Daily Telegraph – London… 14th February 2008… New Solar
... It was found through the use of gravitational microlensing - a method that takes advantage
of the tendency of light rays to bend as they pass close to large objects such as stars.
The gravity of the intervening object warps surrounding space and magnifies light from
objects in the background.
The te ...
Life Cycles of Stars
• Let’s relate that to human scales. What
would that be at one kilometer distance?
• 77 x 1015 tons/(150 x 106km)2 = 3 tons
• Picture a truckload of explosives a km away
giving off a one-second burst of heat and
light to rival the Sun
Ch. 20-2 Sun Study Gd. Revised
... 4. When a meteoroid enters Earth’s atmosphere, friction causes it to burn up and produce a streak of light
called a(n) __________________________________________________ .
5. A chunk of ice and dust whose orbit is usually a long, narrow ellipse is a(n) __________________ .
6. If a meteoroid hits Ear ...
Quiz # 5
... 3. The most probable process for the formation or acquisition of the planets of the Sun is
A) capture of planets from outer space by gravity.
B) relatively slow growth of smaller objects by collisions and mutual gravitational
C) the freezing of immense gas clouds by the cold temperature ...
ASTRONOMY 1001 FALL SEMESTER 2004
... Lecture Notes (these should give you a good idea of the topics that I expect you to know
and understand.) plus labs F, H, and I.
Topics: 1) Light and Radiation:
Blackbody radiation, radiation laws (Stefan-Boltzmann and Wien), temperature
Emission and absorption of radiation, Kirchoff’s radiation law ...
Formation of the Solar System
... rocks (on earth, moon, and mars) are approx.
4.6 billion years old. That’s the generally
accepted age of the solar system.
• Over 150 planets have been identified on other
• This is a “theory”. It ties together all of the
available evidence, and it seems reasonable.
We think it’s right, but…… ...
... of gas and dust (a nebula) that flattened into a disc. This
protoplanetary disc stage was theoretical until the 1990s, when highresolution images from the Hubble Space Telescope began to reveal
such discs in nebulae throughout our galaxy
• Gravitational forces led to clumping of dust and gas into la ...
Solar System and Astronomy puzzle 001
... a star system consisting of two stars orbiting around their
common center of mass
10. natural satellite
12. a massive, gravitationally bound system consisting of stars,
stellar remnants, an interstellar medium of gas and dust
13. growth of a massive object by gravitationally attracting
Cat`s EyE - Chandra X
... WHERE: The Cat’s Eye is found 3,000 light years from
Earth in the middle of the constellation Draco, which
is Latin for “dragon.” Draco is found high in the
The Solar System - MHS-Integrated
... What are Nebulae?
Nebula are cosmic clouds of gas and dust
floating in space. Nebulae are the basic building
blocks of the universe. They contain the
elements from which stars and solar systems are
Life: Definition, Origin, Criteria
... billions of years
• Less than 1.5 times massive than the
Sun; otherwise too much UV
• More than 0.3 times the mass of the Sun;
large warm region near the star for liquid
• Limited to no more than 10 billion stars
... One region of high star field density far (>55°) from the ecliptic plane where the
galactic plane is continuously viewable is centered at RA=19 h45m Dec=35°.
The 55° ecliptic plane avoidance limit is defined by the sunshade size for a large
aperture wide field of view telescope in space.
Describing the Solar System File
... dirty snowballs as they contain
both rock and ice.
The radiation pressure from
the Sun melts the ice forming
the tail of the comet.
The tail always points away
from the Sun.
It`s a bird, it`s a plane…
... exist in the far reaches of
our solar system
• Planets must be round,
orbit the sun, and not be
close to objects of similar
• Pluto’s moon, Charon, is
almost the same size,
which disqualifies Pluto
Panel 3 Ingles ALTA
... atmospheres are affected by geological and, in the case of the Earth,
biological activity. There are four rocky planets in the Solar System:
Mercury, Venus, the Earth and Mars. The Earth also has a rocky
satellite, the Moon, and Mars has two, Deimos and Phobos.
Solar System - Spring Branch ISD
... called gas giants. These planets are _______,
Neptune These planets
Uranus and ________.
are gaseous in nature, composed of mostly
hydrogen and helium
Directed panspermia concerns the deliberate transport of microorganisms in space to be used as introduced species on lifeless planets. Directed panspermia may have been sent to Earth to start life here, or may be sent from Earth to seed exoplanets with life.Historically, Shklovskii and Sagan (1966) and Crick and Orgel (1973) hypothesized that life on Earth may have been seeded deliberately by other civilizations. Conversely, Mautner and Matloff (1979) and Mautner (1995, 1997) proposed that we ourselves should seed new planetary systems, protoplanetary discs or star-forming clouds with microorganisms, to secure and expand our organic gene/protein life-form. To avoid interference with local life, the targets may be young planetary systems where local life is unlikely. Directed panspermia can be motivated by biotic ethics that value the basic patterns of organic gene/protein life with its unique complexity and unity, and its drive for self-propagation.Belonging to life then implies panbiotic ethics with a purpose to propagate and expand life in space. Directed panspermia for this purpose is becoming possible due to developments in solar sails, precise astrometry, the discovery of extrasolar planets, extremophiles and microbial genetic engineering. Cosmological projections suggests that life in space can then have an immense future.