Space Flashcards
The solar system
We now know that the Earth is one of eight planets that travel around the Sun. Each planet travels in an elliptical path and, with the exception of Mercury and Venus, they all have at least one moon. Other objects also orbit the Sun. These are the comets and the asteroids. Note that the status of Pluto was changed from a planet to a dwarf planet in 2005, The orbits of the inner planets are almost circular with the sun at the centre. The ortits of Jupiter, Saturn, Uranus and Neptune are much more elliptical like a rugby ball.
Big Bang theroy
The argument is that the universe started as a singularity 14 billion years ago. Then the universe came into existence suddenly with an enormous explosion called the Big Bang. It immediately went into a short period of rapid growth called inflation. As the universe expanded it cooled and became less dense, this allowed protons neutrons and electrons to form. As it continued the protons neutrons and electrons formed nuclei. After around 380 000 years and further expansion and cooling the first stars came into existence
Life cycle of stars
Nebula -main sequence star
-supergiant -supernova -neutron star or black hole(for very large only)
Bigger than our sun
Or
-red giant -planetary nebula -white dwarf -white dwarf cooling -black dwarf
Similar to our sun
Nebula
a cloud of dust, hydrogen, helium and other gases
Main sequence star
a star apart of a continuous and distinctive band of stars called the main sequence
Supergiant
a very large star that is even brighter than a giant, often despite being relatively cool.
Neutron star
a star with a very small radius and very high density, composed of closely packed neutrons.
Black hole
A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it.
Red giant
a very large star of high luminosity and low surface temperature.
Planetary nebula
a type of emission nebula consisting of an expanding, glowing shell of ionized gas
White dwarf
a small very dense star that is typically the size of a planet.
Black dwarf
a white dwarf that has cooled sufficiently that it no longer emits a significant amount of heat or light.
The order of the planets
Sun Mercury Venus Earth Mars Asteroid belt Jupiter Saturn Uranus Neptune
