Space Flashcards
Which galaxy is sun in ?
Milky way
The first artificial satellite to orbit the Earth was launched into space in 1957.
Describe the orbit of an artificial satellite
Orbits in a circular path
What provides the force needed to keep a satellite in its orbit
Gravity
How is mira different to the sun ?
Tha star mira has a higher mass than the sun
Q3
1 and 2
C and B
The radio wave has a wavelength of 1500 m and a frequency of 200 000 Hz
Calculate the speed of this radio wave
200000 x 1500 = 300 000 000
Speed = 300 000 000 unit= m/s
Many scientists think that the big bang theory describes the….
Beginning of the universe and how its formed
The discovery of cosmic backgorund radiation was important because it…
Provided more evidence to support the big bang theory
What name is given to the effect shown in the spectrum from star A ?
Redshift
Scientists have concluded the that the two stars in a hinary star system orbit around a fixed point between the twin stars
A comparison of the spectra from the two stars in a binary star system provides evidence to support this conclusion
Explain how
(3 marks)
Scientists have found that two stars in a binary star system orbit around a common point by studying their spectra. When the stars move towards us, their light shifts to the blue end of the spectrum, and when they move away, it shifts to the red end. These shifts happen regularly, showing that the stars are orbiting each other. By measuring how much the light shifts, scientists can also figure out the speeds of the stars and their masses. This evidence confirms that the stars are orbiting a fixed point between them.
One theory of the origin of the universe was that billions of years ago all matter was in ine place, then it exploded (big bang)
Describe, in as much detail as you can, how our star (the sun) formed from the time when there was just dust and gas(mostly hydrogen ) up to now when it is in its main stable period.
(5marks)
The Sun formed from a giant cloud of dust and gas, mostly hydrogen, called a nebula. Gravity pulled the particles together, causing the cloud to collapse and spin, forming a protostar at the center. As the protostar’s core got hotter and denser, it reached a temperature high enough for nuclear fusion to start, turning hydrogen into helium and releasing energy. This marked the birth of the Sun. Now, in its main sequence phase, the Sun has been stable for about 4.6 billion years, with the energy from fusion balancing the force of gravity.
Over billions of years the amount of hydrogen in a star decreases. Why ?
Over billions of years, hydrogen in a star decreases as it is converted into helium through nuclear fusion.
Describe how a massive star (at least five times bigger than the sub) will change at the end of the main stable period
(4marks)
At the end of its main stable period, a massive star (at least five times bigger than the Sun) will swell into a red supergiant as it runs out of hydrogen and starts fusing heavier elements. Then, it will explode in a supernova, blasting its outer layers into space. The core will collapse, forming either a dense neutron star or, if it is very massive, a black hole.
Describe the relationship between the lifetime of a main sequence star and its mass
(2 marks)
The lifetime of a main sequence star is directly proportional to its mass, meaning that more massive stars have shorter lifetimes, while less massive stars have longer lifetimes.
Suggests and explanation for the relationship on the 2 marker 😁
The more massive a star is, the faster it burns through its fuel, leading to a shorter lifetime, while less massive stars burn fuel more slowly, giving them longer lifetimes.
