Early Universe
The event that started universe.
What is "the Big Bang"?
A collection of millions and millions of stars held together by gravity.
What is a "galaxy"?
The type of reaction that occurs in the core of all active stars.
What is "nuclear fusion"?
The primary element that makes up the sun.
What is "hydrogen"?
When the Moon is between the Sun and the Earth.
What is a "Solar Eclipse"?
The approximate age of the universe.
What is "13.7 billion years"?
The name of our galaxy.
What is "the Milky Way"?
The main element produced inside stars.
What is "helium"?
Dark, cooler regions on the sun's surface.
What are "sun spots"?
When the Earth is between the Moon and the Sun.
What is a "Lunar Eclipse"?
The instrument which first detected the Cosmic Microwave Background radiation.
What is a "radio telescope"?
The type of our galaxy.
What is a "spiral galaxy"?
The end state of small- and intermediate-mass stars.
What is a "white dwarf"?
An arc of plasma that extends outward from the sun.
What is a "solar flare"?
The cause of the Earth's seasons.
What is "axial tilt"?
The effect on light waves when the source is moving very rapidly away from the observer.
What is "redshift"?
A cloud-like collection of gas and dust.
What is a "nebula"?
The explosion that occurs when a high-mass star has used up all its fuel.
What is a "supernova"?
The stream of high-energy particles expelled from the sun that bombard the planets.
What is the "solar wind"?
The route the shadow of the moon traces along the Earth during a Solar Eclipse.
The name of the effect on electromagnetic waves when their wavelength changes due to the velocity of the source or observer.
What is the "Doppler Effect"?
The minimum number of stars for a cluster to be considered a globular cluster.
What is "100 000"?
The dense, rapidly-rotating core left behind after very large supernovas.
What is a "neutron star"?
The outer layer of the sun.
What is the "Photosphere"?
Earth's axial tilt (in degrees).
What is "23.5"?