Stars, Planets & Moons
This type of object is a giant ball of gas that produces heat and light.
What is a star?
The Sun is classified as this type of object.
What is a star?
Stars are born in these huge clouds made of gas and dust.
What are nebulas?
Light stretches to longer wavelengths when galaxies move away from us in this effect.
What is redshift?
The event that marks the beginning of the universe, involving extremely rapid expansion from a single point.
What is the Big Bang?
Planets do not make their own light. They do this instead.
What is reflect light?
These dark, cooler patches appear on the Sun’s surface.
What are sunspots?
Stars ignite when hydrogen fuses into this element.
What is helium?
Slipher discovered that most galaxies are doing this.
What is moving away?
The Big Bang occurred approximately this long ago.
What is 13.7 billion years ago?
A natural satellite that orbits a planet and does not emit light.
What is a moon?
This process fuses hydrogen into helium in the Sun.
What is nuclear fusion?
A small star eventually becomes this hot, dense object after a planetary nebula forms.
What is a white dwarf?
Hubble discovered a pattern: the farther away a galaxy is, the more this changes.
What is its redshift increases?
About 370,000 years after the Big Bang, the universe cooled enough for these to form.
What are atoms?
As stars become larger and hotter, they appear this colour in the night sky.
What is more blue?
Heat and light from the Sun originate in this region.
What is the core?
Massive stars explode at the end of their life in one of these events.
What is a supernova?
Einstein showed that this “fabric” of the universe can expand and contract.
What is space?
For millions of years after the Big Bang, the universe had no stars. Instead, it mostly contained these.
What are vast clouds of gas?
The Milky Way, Andromeda and several smaller galaxies belong to this structure.
What is the Local Group?
The Sun stays stable because gravity balances this outward force.
What is the outward pressure of fusion?
A star over 20 times the mass of our Sun may collapse into this object from which not even light can escape.
What is a black hole?
Redshift isn’t due to galaxies speeding through space. It happens because this itself increases over time.
What is the expansion of space?
This major observational evidence for the Big Bang is faint microwave radiation left over from the early universe.
What is the cosmic microwave background (CMB)?