Planets
Astrophysics
Man-made Objects in Space
Stars
Famous Astronomers
100

This planet's runaway greenhouse effect has caused it to be the hottest planet in the solar system.

What is Venus?

100

This fundamental force causes Earth to orbit the sun.

What is gravity?

100

This telescope was launched into low Earth orbit in 1990, and continues to take capture high resolution images to this day.

What is the Hubble Space Telescope?

100

This is the brightest star in the night sky.

What is Sirius?

100

This astrophysicist helped popularize the classification of Pluto as a dwarf planet while he was the director of the Hayden Planetarium.

Who is Neil deGrasse Tyson?

200

This planet has the lowest minimum temperature of any planet in the solar system at -224 C.

What is Uranus?

200

This supermassive black hole is at the center of the Milky Way.

What is Sagittarius A?
200

This is one of two active Mars rovers, the other being Curiosity. It is searching for signs of past microbial life, and found possible signs of ancient life in 2024.

What is Perseverance?

200

This is the nearest star to Earth, other than the sun.

What is Proxima Centauri?
200

This polish astronomer and polymath developed and popularized the heliocentric model in Europe.

Who is Nicolaus Copernicus?

300

The largest moon in the solar system, Ganymede, orbits this gas giant.

What is Jupiter?

300

The stretching of light waves caused by the motion of an object away from the observer

What is redshift?

300
This spacecraft crashed into Mercury in 2015, after orbiting the planet for 4 years.

What is Messenger?

300

This star system has a recurrent nova which is expected to be visible from Earth sometime between 2025 and 2027.

What is T Coronae Borealis?

300

This astronomer was the first to theorize black holes (which he called "dark stars") in 1783.

Who is John Michell?

400

This is the name for planets outside of our solar system

What are exoplanets or extrasolar planets?

400

This tiny neutral particle is created in massive numbers by nuclear fusion in the cores of stars and by supernovae.

What is a neutrino?

400

The first space station, which was launched in 1971.

Salyut 1

400

This red hypergiant is often given the title of the largest known star, with an estimated volume 750 million times than that of the sun.

What is UY Scuti?

400

This Persian astronomer made the first known observation of the Andromeda galaxy.

Who is Abd al-Rahman al-Sufi?

500

This planet has the strongest magnetic field of any terrestrial planet in the solar system.

What is Earth?

500

This spinning disk of gas and dusk may form around a young star, leading to the creation of planets.

What is a protoplanetary disk?

500

In 2024, this Russian cosmonaut took the record for most days spent in space. He still holds the record at 1,111 total days.

Who is Oleg Kononenko?

500

This is the oldest known star, with an age estimated age of 13.7 billion years old.

What is the Methuselah star or HD 140283?

500

This American astronomer is credited with creating the Harvard Classification Scheme, the first serious modern attempt to classify stars based on temperatures and spectral types.

Who is Annie Jump Cannon?