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Astronomy DSST Free Clep Study Guide questions and answers rated A+ 2025/2026
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Astronomy DSST Free Clep StudyGuide
Heliocentric Theory - ANSPlaces the solar at the middle of the solar machine, pointing out
that ll other bodies within the sun gadget orbit it. This became in direct contradiction to
Ptolemy's geocentric idea, which stated Earth changed into the center of the Universe.
Geocentric Theory - ANSEarth is the center of the Universe
Nicolaus Copernicus - ANSWidely credited as the father of the heliocentric theory. Although
he changed into now not the first to advocate the concept, his was the first mathematical
version which efficaciously anticipated the motion of the planets. He later published a book
which became instrumental in making the idea famous.
Hans Lippershey - ANSUsually credited because the inventor of the telescope (though it
wasn't called that for decades later). He turned into a German-Dutch lens maker who first
implemented for the patent of the "Dutch Perspective Glass". It is crucial to notice that, on
the time, these were now not used for astronomy. That got here a touch later with Galileo.
Galileo Galilei - ANSWas the first to use a telescope for astronomical research. He later
used that telescope to find out the four largest moons of Jupiter. Galileo changed into a firm
believer inside the heliocentric theory. Since most scientists of the time and, extra
importantly, the Church embraced the geocentric concept, this induced Galileo a lot trouble
and become the motive he changed into later located beneath residence arrest until his
demise.
Celestial Sphere Theory - ANSIn the early days of astronomy, there had been plenty of
theories like the geocentric idea which had been later disproven. Another of these theories
was something referred to as the celestial sphere idea. This theory stated that what we see
within the sky was without a doubt numerous spheres. You can consider the spheres as
clear globes across the Earth with planets, comets and stars inside each of these globes.
Some of these were thought to be in our personal atmosphere and others have been farther
away. Even Copernicus, who got it so proper with the Heliocentric idea, still believed in these
celestial spheres. For example his model of the universe had the starts offevolved at same
distance from the Earth in one of the maximum remote spheres.
Tycho Brahe - ANSDisproved the celestial sphere theory that each one celestial items have
been unmoving gadgets in Earth's sky. He validated this was unfaithful through statement of
a supernova, which he proved become past the solar gadget and hence now not a
phenomenon within Earth's ecosystem.
Johannes Kepler - ANSHe became a mathematician who proposed the 3 Laws of Planetary
Motion. These said that the planets circulate in an elliptical orbit around the solar and
, mathematically showed how it became possible. Kepler's laws provide the constructing
blocks for many theories to comply with.
First Law of Planetary Motion (The Law of Ellipses) - ANSThis law says that the planets
orbits are elliptical in nature and that the center of the solar is a focus for the ones ellipses.
Second Law of Planetary Motion (The Law of Equal Areas) - ANSThis regulation describes
how speedy the planets are transferring across the solar. The nearer the planet receives to
the sun, the quicker it movements. As it movements farther far from the solar, it's going to
gradual down. However, the second law additionally says that if we drew a line from the
middle of the solar to the middle of the planet, we would see that every 31 days the area
protected by means of the road would be the equal. Hence the name - "Law of Equal Areas".
Third Law of Planetary Motion (The Law of Harmonics) - ANSThis one calls for some math. I
might spend a few minutes wrapping your head round this regulation in case you're asked
approximately it at the exam. Basically, the third regulation of planetary movement says that
the orbital durations of various planets are associated. Specifically, that the ratio of the
squares of the orbital durations to the cubes of the average distance from the solar are the
equal. In different words - You take the period of time the planet takes to complete an orbit
across the sun and rectangular that wide variety. You then take the planet's Average
Distance from the solar and cube it. The ratio among those numbers will be the same
regardless of what planet you operate the method for. Pretty cool, eh?
Isaac Newton - ANSHe invented the first functional reflective telescope (We'll cowl what a
reflective telescope is a bit later). Newton also proposed the 3 laws of movement and the
regulation of everyday gravitation.
First Law of Motion - ANSThis law (paraphrased) states that an object at rest will live at rest
until acted upon with the aid of an outdoor pressure. Likewise an object in movement will not
alternate its velocity until acted upon via an outdoor pressure. This is also called the Law of
Inertia.
Second Law of Motion - ANSThis law (paraphrased) states that an item's mass is
immediately proportional to how a good deal pressure is going to be had to circulate that
item. In other phrases, pushing a big field of tissue paper goes to be a whole lot easier than
pushing an equally big container of rocks. The box of rocks has a much large mass than the
container of tissue paper, despite the fact that they're the identical size. Newton's 2nd
regulation provided a components to decide simply how a great deal force was wanted in an
effort to accelerate an item based on its mass.
Third Law of Motion - ANSThis regulation states that to every action there is always an same
and opposite reaction: or the forces of our bodies on every different are usually identical and
are directed in opposite guidelines.
Law of Universal Gravitation - ANSStates that the whole thing within the universe has a
gravitational subject that impacts other objects, and the way sturdy that field is depends at
the item's mass and how near the two gadgets are to every different.
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