Earth and Space

A tiny piece of matter, an atom or part of an atom, a molecule

particle

what is a self-luminous celestial body consisting of a mass of gas held together by its own gravity

star

the theory that describes the universe originated approximately 14 billions years age from an extremely high density and temperature

the big bang

what is the layer around the earth called that consists of gas

atmosphere

what is a rare celestial event involving an explosion of most of the material in a star, resulting in an extremely bright, short-lived object that emits vast amounts of energy

supernova

the gravitationally curved path of one object around a point or another body

orbit

the sun and all the material that orbit it including the planets

solar system

the sun and all the material that orbit it including the planets

solar system

the path in which light travels from luminous objects like the sun and moon

ray

a substance made of atoms that have the same atomic number

element

often referred to as a natural satellite of earth

moon

all matter an energy, including earth and all intergalactic space as a whole is regarded as what

universe

what is the third planet from the sun

earth

the study of origin, evolution, motions, compositions and natural of celestial bodies is often referred to as

astronomy

a non-metal element which is a key component of living things

carbon

imaginary line in which a celestial body rotates

axis

to go around something in a circle: to turn around in a circle

revolve

to spin on its axis

rotate

relating to or resembling the moon

lunar

often referred to as a stage

phase

what does lines on a optical spectra represent

absorption

How old is the Big Bang?

13.8 billion years old

red shift

light that looks redder caused by an increase in the wavelength as it moves toward or away from the detector or doppler effect

what 3 pieces of evidence do we have for the big bang theory

elements created, cosmic background radiation, and hubbles law

what is the idea of hubbles law

constant expansion of the universe

what year of the universe are we seeing

2.5 million years

two immediate products of hydrogen fusing the sun

hydrogen and helium

heaviest element created by nuclear fusion in the core of a star

iron

why is the increasing temperature of matter an important step in the lightning up of a star

it releases an incredible amount of energy

why do we have seasons

The tilt of the Earth's axis

period in a stars life when it is fusing hydrogen into helium

star life or main sequence (same thing)

the shape of planetary orbits are best descried as

elliptical

approximately how long does it take the moon to orbit the earth

1 month

in the sun's core, hydrogen atoms combines to form helium atoms

nuclear fusion

as a star like our sun ages, the elements created become

more complex

although the releases tremendous amounts of______ the actual percentage of this energy that reaches the earth is small

radiation