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Notes on video lecture:
Dwarf Planets and Beyond, Getting a Feel for Cosmic Distances
Notes taken by Edward Tanguay on June 2, 2014 (go to class or lectures)


Choose from these words to fill the blanks below:
spiral, ices, Saturn, Galileo, 50, binary, Dawn, planets, 2004, transfer, 2005, 2015, massive, Kuiper, 200, elongation, interstellar, four, Neptune, parallax, overhead, bulge, Dysnomia, Sirius, Piazzi, sunset, Mars, parsecs, 100, hydrostatic
solar system
dwarf planets besides Pluto
Eris
most of the dwarf planets
1% of earth's mass
discovered in
has one moon
Ceres
the largest object in the asteroid belt, which lies between the orbits of and Jupiter
a ball of rock and ice 950 km in diameter, containing a third of the mass of the asteroid belt
the largest asteroid, and the only dwarf planet in the inner Solar System
it was the first asteroid to be discovered, on 1 January 1801 by Giuseppe in Palermo, at first considered to be a planet
the unmanned spacecraft is scheduled to arrive at Ceres in early
named after the Roman Goddess of Agriculture
Haumea
located beyond Neptune's orbit
discovered in
named after Haumea, the Hawaiian goddess of childbirth
its extreme makes it unique among known dwarf planets, nonetheless, its gravity is believed sufficient for it to have relaxed into equilibrium, making it a dwarf planet
Makemake
perhaps the largest belt object (KBO)
has no known satellites, which makes it unique among the largest KBOs and means that its mass can only be estimated
discovered on March 31, 2005
the name derives from Makemake in the mythology of the Rapanui people of Easter Island
many others
nearest star is Alpha Centauri
4.37 light years from the Sun
277,600 AU
actually a star system
this pair of stars have an 80 year orbit around a common center, and are about as close to each other as and the Sun
how long would it take to travel from Earth to Mars at 20,000 km/hr (Voyager 1 is traveling about 61,000 km/hr)
if the planets didn't move it would take about days
since both are orbiting the sun, you would have to travel in a orbit, so it would take about days
Voyager 1
as of September 2013, Voyager 1 was at a distance of 18.7 billion kilometers (125.3 AU) from the Sun, and escaping the solar system at a speed of about 3.6 AU per year
this year Voyager 1 space craft crossed into space
the earth
distance from sun
150 million kilometers
1 AU, or astronomical unit
some planets are 10 or 20 AU from their sun
Saturn: 9 AU - 10.1 AU from Sun
the Kepler telescope has been exploring planets of other stars and has found planets even a 0.3 AU from their sun
planets
stars twinkle and planets don't
brightest start is
Greek for "glowing"
actually two stars, Sirius A and Sirius B, distance between them varies between 8.2 and 31.5 AU
Venus always close to the Sun
will always see it soon after or right after sunrise
Jupiter is always very bright
often seen directly
with binoculars, you may be able to see moons
first discovered by
Sumerians referred to the "stars" that moved "wanderers", these were
because planets are so much closer
moon
cratered structure
fascinated Galileo
craters reflect the history of the moon
old view of solar system
Pluto was seen as a planet but had an odd orbit, actually crossing in closer than at times
the current system is much more messy, Pluto is just one of known dwarf planets that make up the Kuiper Belt
Pluto is not that special anymore, actually smaller than Eris and about the same size as 2003 EL61
Eris: 67.69 AU
Pluto: 39.54 AU
dwarf planets are discovered through a concept called
displacement or difference in the apparent position of an object viewed along two different lines
90377 Sedna
three times as far from Sun as Neptune
surface is largely a mixture of water, methane and nitrogen
surface is one of the reddest in the Solar System
Sirius (Dog Star) - bright in northern hemisphere
Alpha Centuri - bright in southern hemisphere
parallax is used to measure distances to distant stars as well
the parallax that a typical star would have is about:
one arc second
1 parsec
3.26 light years
206,000 astronomical units
most of the solar system is mostly space
Neptune is 30 AU
nearest star is 206,000 AU
our galaxy the Milky Way
center of our galaxy forms a
distance to the center of our galaxy is about 8000 parsecs or 24,000 light years
our galaxy is one of many galaxies
the width of our galaxy is about 30,000 , or 90,000 light years
most of the young stars are forming in the arms
Vocabulary:
People:
![]() |
######################### (1946-) American astrophysicist, cosmologist and Nobel Prize winner in Physics for his work on the COBE Satellite
|
Flashcards:
how far away are we from the center of our galaxy?
8,000 parsecs, or 24,000 light years
how wide is the Milky Way galaxy
30,000 parsecs, or 90,000 light years
how close is the nearest star and how long would it take to get there traveling 10 km/s
4 light years away, and would take 120,000 years (Voyager is traveling at about 17k/s)
what is the brightest star
Sirius
what is the nearest star
Alpha Centauri
what is another dwarf planet besides Pluto?
Eris
Ideas and Concepts:
Via tonight's Imagining Other Earths class: "With the new discoveries of dwarf planets in the Kuiper Belt within the last 10 years, it was either degrade Pluto from planet to dwarf planet status, or upgrade all the newly discovered dwarf planets to planet status, and thus make elementary students everywhere memorize more than 50 additional planets, most of which have names consisting almost completely of numbers."
Scientific discovery principle of the day, via this morning's Imagining Other Earths class: "parallax, n. the displacement in the apparent position of an object viewed along two different lines of sight and measured by the angle between those two lines, e.g. astronomers use the principle of parallax to measure distances to the closer stars and to dwarf planets. A simple everyday example of parallax can be seen in the dashboard of a car that uses a needle-style speedometer gauge, when viewed directly from the front, the speed may show exactly 60, but when viewed from the passenger seat, the needle may appear to show a slightly different speed, due to the angle of viewing."
