Space

Select the definition of an Astronomical Unit (AU).

What is an arcsecond equal to?

Our Sun has a radius of 6.96x10⁸ m and a temperature of 5778 K. Earth is approximately 1 AU from the Sun. Calculate the intensity of radiation received by Earth from the Sun. 1 AU = 1.5x10¹¹ m

Select the definition of a light year (ly).

Complete the sentence: "The greater the angle of parallax ________________."

The temperature, T, of a star doubles. What effect does this have on the luminosity?

A star seen in the sky from Earth has an angle of parallax 2.42x10^-3 arcseconds. Calculate the star's distance from Earth.1 AU = 1.5x10¹¹ m

What is not an example of a standard candle?

Select the definition of a parsec (pc).

The exoplanet HD20794e is 0.509 AU from it's star, HD20794 (catchy names huh!). HD20794 has a radius 90% of our Sun and temperature of 5216.85°C. Calculate the intensity of radiation received by HD20794e from HD20794. 1 AU = 1.5x10¹¹ m, R_Sun = 6.96x10⁸ m

Betelgeuse is a star approximately 220 pc from Earth. Calculate Betelgeuse's angle of parallax. 1 pc = 2.06265×10⁵ AU, 1 AU = 1.5x10¹¹ m

The distance from Sheffield, U.K. to Sheffield, Alabama is 6745.78 km. What is the correct conversion to AU? 1 AU = 1.5x10¹¹ m

A Hertzsprung-Russell diagram is shown above, select the correct combination of labels.

A star has high luminosity and a relatively low surface temperature. Where would you locate it on the H-R diagram?

Which would occurs first in a massive star's life cycle: a supernova or neutron star?

Where would you locate a Neutron Star on the H-R diagram?

Select a word to complete the sentence: "The _________ the star, the quicker it will run out of fuel."

Using the image above, select the correct order for the expected life cycle of our Sun.

Acrab (Arabic: العقرب‎) is a star with luminosity 31,600 and a temperature of 28,000 K, approximately where would you locate it on a H-R diagram?

Select the best word to complete the sentence: "At the centre of a star, ____________ takes place."

Which would occurs first in a massive star's life cycle: a black hole or neutron star?

Shown above is H-R diagrams with multiple stars plotted from the same stellar cluster. Which H-R diagram shows the oldest cluster.

A star has low luminosity and a relatively high surface temperature. Where would you locate it on the H-R diagram?

Shown above is H-R diagrams with multiple stars plotted from the same stellar cluster. Which H-R diagram shows the youngest cluster.

When a light source moves away from an observer, the wavelength becomes ____________.

Which stationary observer will hear a higher pitched sound?

When a light source moves away from an observer, the light undergoes __________.

Select the best definition for the Big Bang Theory.

Andromeda has a redshift of -0.001001, what is it's movement in relation to Earth?

A galaxy has redshift of 0.19. Estimate the speed it is moving relative to Earth. H₀ = 75 kms^-1MPc^-1. 1 year ≈ 3.16x10⁷s, 1 pc ≈ 3.09x10¹⁶ m, c = 3x10⁸ ms^-1

A galaxy has redshift of -0.32. Estimate the speed it is moving relative to Earth. H₀ = 75 kms^-1MPc^-1. 1 year ≈ 3.16x10⁷s, 1 pc ≈ 3.09x10¹⁶ m, c = 3x10⁸ ms^-1

On this graph, which line represents the density of the universe is less than the critical density?

A galaxy has redshift of 0.48. Estimate the distance it is from Earth in light years. H₀ = 75 kms^-1MPc^-1. 1 year ≈ 3.16x10⁷s, 1 pc ≈ 3.09x10¹⁶ m, c = 3x10⁸ ms^-1

Estimate the diameter of the observable universe. H₀ = 75 kms^-1MPc^-1. 1 year ≈ 3.16x10⁷s, 1 pc ≈ 3.09x10¹⁶ m, c = 3x10⁸ ms^-1