is the science that studies the composition, position, and movements of all objects in space.
a scientist who studies astronomy
a pattern of stars arranged as a mythical figure or animal
are parts of constellations. The big dipper is part of the constellation ursa major
three constellations that always appear in our night sky: Dig Dipper, Little Dipper and Casseopia.
He suggested the sun is the center of our solar system
the spinning of an object around an imaginary axis.
the number of hours of daylight
He constructed accurate telescopes and discovered moons and rings around planets.
when the earth is farthest away from the sun
he created the laws of planetary motion
when the earth is closest to the sun (Jan 3)
the change in direction of the Earth's axis
when the sun is above and below the horizon an equal amount of time
the part of the sun that is visible during a complete solar ecllopse. The outer atmosphere of the sun.
the view that the earth is the center of the universe
the type of eclipse that occurs when it is sun, moon, earth
very strong tides, very high and very low, when the sun,earth and moon are lined up
when the sun is at the highest and lowest positions in the sky
the day with the least hours of sunlight
the day with the most hours of sunlight
the motion of an object around another object (a year)
the apparent slowing, reversal and looping of a planet in its path across the sky
Eclipse when it is sun, earth, moon
the view that the sun is the center of the solar system
Caused by the tilt of the earth's axis
caused by the gravitational pull between the earth and the moon and the sun.
weak tides, when the sun and moon are perpendicular to each other with respect to the sun.
one of the four planets furthest from the sun, the gas giants, Jupiter, Saturn, Uranus and Neptune
most of the planet is made up of gasses. Another name for the outer planets: Jupiter, Saturn, Uranus and Neptune.
The planets closest to the sun; Mercury, Venus, Earth, and Mars. They are also known as the terrestrial planets.
one of the dense rocky planets nearest to the sun: Mercury, Venus, Earth, and Mars.
any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)and are too small to be called planets
large meteors that reach the earth's surface and hit the surface
A STREAK OF LIGHT in the sky produced by the burning of a meteoroid in Earth's atmosphere, a falling star. It doesn't hit the ground.
frozen chunks of rocks and metalllic particles that orbit the sun in long elliptical paths
Big splash theory
The current theory that explains the formation of the moon; it states that, approximately 4.5 billion years ago, the moon was formed as a result of an object colliding with earth, causing less dense portions to be blasted into space.
rotating nebula theory
Theory of the formation of solar system. It started as a nebula which collapses and then then sun forms. The remaining particles rotate around the sun and clump forming protoplanets and then terrestrial planets. When the sun powered up it blasted the gases out further which ended up forming the gas giants.
He discovered the existence of other galaxies and determined that galaxies are moving away from us
a shift of the spectral lines to longer wavelengths. The greater the shift, the faster the galaxy is moving away from us
a range of wavelengths, evident by bands of light, seen through a spectroscope. Each chemical element has its own spectrum. (color bands)
an instrument that splits and spreads out light into a spectrum.
big bang theory
the theory that all matter and energy in the universe was compressed into an extremely small volume that 13 billion to 15 billion years ago exploded and began expanding in all directions
the distance light travels in one year
an apparent shift in the position of a star against the background of more distant non-moving stars.
a method of determining the distance to a point using two angles and a baseline of known distance.
the measurement between two fixed points, used in triangulation. Used to measure the distance of stars. The longest baseline used is the diameter of the earth's orbit.
hydrogen nuclei fuse to form helium nuclei.The reaction releases an enormous amount of energy
cepheid variable stars
are unstable big stars that are 1000x brighter than the sun and the pulse, they have predictable brightness and behavior, brighter=closer, dimmer=further, they are found in most galaxies and are used to determine distance
Amount of light a star actually gives off.
How bright a star appears to be.
The surface of the sun.
He stated that the earth is the centre of the universe
The speed needed for a rocket to escape the pull of the Earth's gravity
The orbit of a satellite when it stays in the same position above the Earth.
a gaseous layer of the sun's inner atmosphere
the Sun's outer atmosphere, consisting of thin , hot gases
dark spots on the Sun's surface, varying in size and regularity, caused by disturbances in the Sun's magnetic field. These are the origin of solar flares/prominences.
huge, arching line of gas, released from the photosphere. They last several weeks.
brief expulsion of large quantities of gas and charged particles originating from sunspots.
an ionized gas emitted from the Sun from solar flares and prominences. This gas enters our atmosphere and causes the northern lights.
the area on the Hertzsprung-Russel diagram where the majority of stars are found
An oval shaped galaxy that is very old, and has very little dust and gas.
a galaxy shaped like a pinwheel. Our Milky Way galaxy is an example of this type of galaxy.
Barred spiral galaxy
A galaxy that is similar to a spiral galaxy, except that the spiral arm pattern originates from a bar of material that passes through the nucleus of the galaxy.
a galaxy that does not have a regular shape
a star-like object that may send out radio waves and other forms of energy
a large, round, densely-packed grouping of thousands to millions of older stars
a star cluster that has a loose, disorganized appearance and contains no more than a few hundred, typically young, stars.
optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece -Isaac Newton
a form of energy that exhibits wavelike behavior as it travels through space
optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece-Galileo
a spacecraft that has various scientific instruments that can collect data, including visual images, but has no human crew
a group of about 30 galaxies that includes the Milky Way
a unit of measure equal to the mass of the sun
the beginnings of the formation of a star
a collection of dust and gases, consisting mainly of hydrogen and helium
A star that expands and cools once it runs out of hydrogen fuel
a dim star that forms from a collapsed red giant
a white dwarf whose light has gone out, and is no longer visible
the brilliant explosion of a dying supergiant star
the end stage of a high mass star life cycle . It is a star that emits light and a beam of very high energy radio waves
Remnant of a very high mass star that is so dense that nothing, not even light, can escape its gravity field.
The star formed when a high and very high mass star runs out of fuel and expands.