Bigger than Big- Term 2 2023

the distance light travels in one year

a giant group of dust, gas, and stars held together by gravity

space and all matter in it

a system made up of the Sun, the eight planets and their moons, dwarf planets, and smaller objects

a force that pulls two objects toward each other

large hot spheres of hydrogen gas powered by nuclear fusion reactions in the core

an area between the orbits of Mars and Jupiter where most asteroids are located

A large body in space that orbits a star and does not produce light of its own

an object that orbits a planet or a dwarf planet

a planet made up mostly of gases and is called a gas giant

a collection of gases that surround a planet

a planet made up of rocks or metals with a solid surface

a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

The average distance between Earth and the sun, about 150 million kilometers

a star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons

An object whose gravity is so strong that nothing, not even light, can escape.

A small, hot, dim star that is the leftover center of an old star

A star that expands and cools once it runs out of hydrogen fuel

A gigantic explosion in which a massive star collapses and throws its outer layers into space

A method for measuring the distances to nearby stars that relies on the fact that a star appears displaced relative to the background of distant stars when viewed from two different positions in space. Satellites orbit outside the Earth's atmosphere can measure distances up to almost 1000 pc in this way.

A gigantic explosion in which a massive star collapses and throws its outer layers into space

research proved universe still expanding;

a telescope that picks up sound waves from very distant stars

Telescopes in orbit above Earth's atmosphere.

A device built to observe distant objects by making them appear closer

This has wavelengths that are longer than visible light, and can be felt as heat.

Telescope designed to detect infrared radiation

Cosmological model that explains the sudden development of the universe through expansion from a hot, dense state.

a theory which states that there was no beginning to the universe and that the universe does not change in appearance.

the series of events that occurs in the life of any star

organizes the family of stars into a diagram; across bottom is star's temperature and side is star's absolute magnitude; a star's temperature and color depend on how big the star is

Naturally occurring background radiation from outer space.

warming that results when solar radiation is trapped by the atmosphere

A rise in the average temperature of Earth's atmosphere and oceans. It is caused by increased concentrations of greenhouse gases in the atmosphere, resulting from human activities such as deforestation and burning of fossil fuels.

loss of ozone molecules in atmosphere resulting in increase in harmful solar radiation reaching ground level

declining number and variety of the species in an area

the increased height of the level of seas and oceans