7.1

Question 1

absolute magitude

Answer 1

measure of how bright a star actually is

Question 2

apparent magnitude

Answer 2

measure of how bright star appears to be

Question 3

blue super giants

Answer 3

stars that are 10 or times bigger than the sun

Question 4

binary star system

Answer 4

two stars orbiting a centre of mass

Question 5

black hole

Answer 5

singularity. collapsed star so massive there’s no light

Question 6

density

Answer 6

mass per unit volume of material

Question 7

electromagnetic spectrum

Answer 7

different types of electromagnetic radiation ranging from radio waves to gamma rays

Question 8

gamma rays

Answer 8

high energy electro mag waves

Question 9

gavitational lensing

Answer 9

bending of light rays due to distortion of space by a big item

Question 10

gavity

Answer 10

force that causes matter to gather

Question 11

isotope

Answer 11

atoms with the same number of protons` but different numbers of nutrons

Question 12

light year

Answer 12

distance light travels in a year

Question 13

magnitude

Answer 13

brightness of star

Question 14

main sequence

Answer 14

group of stars lying on a line running from top left to bottom right of HR diagram

Question 15

neutrino

Answer 15

almost mass less particle

Question 16

neutron star

Answer 16

remnant of a supernova

Question 17

nuclear fusion

Answer 17

hydrogen is converted to helium to produce light and heat

Question 18

parallax

Answer 18

technique used to measure distance to other stars

Question 19

prasec

Answer 19

equal to 3.26 light years

Question 20

plasma

Answer 20

positively charged ions and free electrons

Question 21

positron

Answer 21

positive electron

Question 22

planetary nebula

Answer 22

gas cloud produced when a red giant runs of of fuel

Question 23

radiation pressure

Answer 23

force produced by radiation from hot object

Question 24

red giant

Answer 24

star produced when core of a sun size star runs our of hydrogen

Question 25

spectral class

Answer 25

classification system for stars based on their colour

Question 26

spectrometer

Answer 26

device that splits light into a spectrum to show it's competent wave lengths

Question 27

stellar parallax

Answer 27

apparent change in position of a star throughout the year due to Earth's motion around the Sun

Question 28

super massive black hole

Answer 28

a black hole millions or billions times bigger than the sun found at the centre of a galaxy

Question 29

supernova

Answer 29

giant explosion that occurs when a star much larger than the sun runs out of nuclear fuel

Question 30

white dwarf

Answer 30

hot, dense star that is the remains of a red giant